Merge branch 'master' into ls_selinux

.vscode/cspell.dictionaries/jargon.wordlist.txt

@@ -9,6 +9,8 @@ bytewise
 canonicalization
 canonicalize
 canonicalizing
+codepoint
+codepoints
 colorizable
 colorize
 coprime

Cargo.lock

@@ -3198,7 +3198,6 @@ name = "uu_unlink"
 version = "0.0.7"
 dependencies = [
  "clap",
- "libc",
  "uucore",
  "uucore_procs",
 ]
@@ -3277,6 +3276,8 @@ dependencies = [
  "getopts",
  "lazy_static",
  "libc",
+ "nix 0.20.0",
+ "once_cell",
  "termion",
  "thiserror",
  "time",

Cargo.toml

@@ -98,6 +98,7 @@ feat_common_core = [
     "touch",
     "unexpand",
     "uniq",
+    "unlink",
     "wc",
     "yes",
 ]
@@ -182,7 +183,6 @@ feat_require_unix = [
     "timeout",
     "tty",
     "uname",
-    "unlink",
 ]
 # "feat_require_unix_utmpx" == set of utilities requiring unix utmp/utmpx support
 # * ref: <https://wiki.musl-libc.org/faq.html#Q:-Why-is-the-utmp/wtmp-functionality-only-implemented-as-stubs?>

src/bin/coreutils.rs

@@ -10,10 +10,12 @@ use clap::Arg;
 use clap::Shell;
 use std::cmp;
 use std::collections::hash_map::HashMap;
+use std::ffi::OsStr;
 use std::ffi::OsString;
 use std::io::{self, Write};
 use std::path::{Path, PathBuf};
 use std::process;
+use uucore::display::Quotable;
 
 const VERSION: &str = env!("CARGO_PKG_VERSION");
 
@@ -76,13 +78,21 @@ fn main() {
 
     // 0th argument equals util name?
     if let Some(util_os) = util_name {
-        let util = util_os.as_os_str().to_string_lossy();
+        fn not_found(util: &OsStr) -> ! {
+            println!("{}: function/utility not found", util.maybe_quote());
+            process::exit(1);
+        }
+
+        let util = match util_os.to_str() {
+            Some(util) => util,
+            None => not_found(&util_os),
+        };
 
         if util == "completion" {
             gen_completions(args, utils);
         }
 
-        match utils.get(&util[..]) {
+        match utils.get(util) {
             Some(&(uumain, _)) => {
                 process::exit(uumain((vec![util_os].into_iter()).chain(args)));
             }
@@ -90,9 +100,12 @@ fn main() {
                 if util == "--help" || util == "-h" {
                     // see if they want help on a specific util
                     if let Some(util_os) = args.next() {
-                        let util = util_os.as_os_str().to_string_lossy();
+                        let util = match util_os.to_str() {
+                            Some(util) => util,
+                            None => not_found(&util_os),
+                        };
 
-                        match utils.get(&util[..]) {
+                        match utils.get(util) {
                             Some(&(uumain, _)) => {
                                 let code = uumain(
                                     (vec![util_os, OsString::from("--help")].into_iter())
@@ -101,17 +114,13 @@ fn main() {
                                 io::stdout().flush().expect("could not flush stdout");
                                 process::exit(code);
                             }
-                            None => {
-                                println!("{}: function/utility not found", util);
-                                process::exit(1);
-                            }
+                            None => not_found(&util_os),
                         }
                     }
                     usage(&utils, binary_as_util);
                     process::exit(0);
                 } else {
-                    println!("{}: function/utility not found", util);
-                    process::exit(1);
+                    not_found(&util_os);
                 }
             }
         }

src/uu/base32/src/base32.rs

@@ -38,7 +38,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     let name = uucore::util_name();
 
     let config_result: Result<base_common::Config, String> =
-        base_common::parse_base_cmd_args(args, &name, VERSION, ABOUT, &usage);
+        base_common::parse_base_cmd_args(args, name, VERSION, ABOUT, &usage);
     let config = config_result.unwrap_or_else(|s| crash!(BASE_CMD_PARSE_ERROR, "{}", s));
 
     // Create a reference to stdin so we can return a locked stdin from
@@ -52,12 +52,12 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         config.wrap_cols,
         config.ignore_garbage,
         config.decode,
-        &name,
+        name,
     );
 
     0
 }
 
 pub fn uu_app() -> App<'static, 'static> {
-    base_common::base_app(&uucore::util_name(), VERSION, ABOUT)
+    base_common::base_app(uucore::util_name(), VERSION, ABOUT)
 }

src/uu/base32/src/base_common.rs

@@ -9,6 +9,7 @@
 
 use std::io::{stdout, Read, Write};
 
+use uucore::display::Quotable;
 use uucore::encoding::{wrap_print, Data, Format};
 use uucore::InvalidEncodingHandling;
 
@@ -40,8 +41,9 @@ impl Config {
                 let name = values.next().unwrap();
                 if let Some(extra_op) = values.next() {
                     return Err(format!(
-                        "extra operand '{}'\nTry '{} --help' for more information.",
-                        extra_op, app_name
+                        "extra operand {}\nTry '{} --help' for more information.",
+                        extra_op.quote(),
+                        app_name
                     ));
                 }
 
@@ -49,7 +51,7 @@ impl Config {
                     None
                 } else {
                     if !Path::exists(Path::new(name)) {
-                        return Err(format!("{}: No such file or directory", name));
+                        return Err(format!("{}: No such file or directory", name.maybe_quote()));
                     }
                     Some(name.to_owned())
                 }
@@ -61,7 +63,7 @@ impl Config {
             .value_of(options::WRAP)
             .map(|num| {
                 num.parse::<usize>()
-                    .map_err(|_| format!("invalid wrap size: '{}'", num))
+                    .map_err(|_| format!("invalid wrap size: {}", num.quote()))
             })
             .transpose()?;
 

src/uu/base64/src/base64.rs

@@ -38,7 +38,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = usage();
     let name = uucore::util_name();
     let config_result: Result<base_common::Config, String> =
-        base_common::parse_base_cmd_args(args, &name, VERSION, ABOUT, &usage);
+        base_common::parse_base_cmd_args(args, name, VERSION, ABOUT, &usage);
     let config = config_result.unwrap_or_else(|s| crash!(BASE_CMD_PARSE_ERROR, "{}", s));
 
     // Create a reference to stdin so we can return a locked stdin from
@@ -52,7 +52,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         config.wrap_cols,
         config.ignore_garbage,
         config.decode,
-        &name,
+        name,
     );
 
     0

src/uu/basenc/src/basenc.rs

@@ -47,7 +47,7 @@ fn usage() -> String {
 }
 
 pub fn uu_app() -> App<'static, 'static> {
-    let mut app = base_common::base_app(&uucore::util_name(), crate_version!(), ABOUT);
+    let mut app = base_common::base_app(uucore::util_name(), crate_version!(), ABOUT);
     for encoding in ENCODINGS {
         app = app.arg(Arg::with_name(encoding.0).long(encoding.0));
     }
@@ -88,7 +88,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         config.wrap_cols,
         config.ignore_garbage,
         config.decode,
-        &name,
+        name,
     );
 
     0

src/uu/cat/Cargo.toml

@@ -18,7 +18,7 @@ path = "src/cat.rs"
 clap = { version = "2.33", features = ["wrap_help"] }
 thiserror = "1.0"
 atty = "0.2"
-uucore = { version=">=0.0.9", package="uucore", path="../../uucore", features=["fs"] }
+uucore = { version=">=0.0.9", package="uucore", path="../../uucore", features=["fs", "pipes"] }
 uucore_procs = { version=">=0.0.6", package="uucore_procs", path="../../uucore_procs" }
 
 [target.'cfg(unix)'.dependencies]

src/uu/cat/src/cat.rs

@@ -20,6 +20,7 @@ use clap::{crate_version, App, Arg};
 use std::fs::{metadata, File};
 use std::io::{self, Read, Write};
 use thiserror::Error;
+use uucore::display::Quotable;
 use uucore::error::UResult;
 
 #[cfg(unix)]
@@ -28,8 +29,6 @@ use std::os::unix::io::AsRawFd;
 /// Linux splice support
 #[cfg(any(target_os = "linux", target_os = "android"))]
 mod splice;
-#[cfg(any(target_os = "linux", target_os = "android"))]
-use std::os::unix::io::RawFd;
 
 /// Unix domain socket support
 #[cfg(unix)]
@@ -136,10 +135,18 @@ struct OutputState {
     one_blank_kept: bool,
 }
 
+#[cfg(unix)]
+trait FdReadable: Read + AsRawFd {}
+#[cfg(not(unix))]
+trait FdReadable: Read {}
+
+#[cfg(unix)]
+impl<T> FdReadable for T where T: Read + AsRawFd {}
+#[cfg(not(unix))]
+impl<T> FdReadable for T where T: Read {}
+
 /// Represents an open file handle, stream, or other device
-struct InputHandle<R: Read> {
-    #[cfg(any(target_os = "linux", target_os = "android"))]
-    file_descriptor: RawFd,
+struct InputHandle<R: FdReadable> {
     reader: R,
     is_interactive: bool,
 }
@@ -296,7 +303,7 @@ pub fn uu_app() -> App<'static, 'static> {
         )
 }
 
-fn cat_handle<R: Read>(
+fn cat_handle<R: FdReadable>(
     handle: &mut InputHandle<R>,
     options: &OutputOptions,
     state: &mut OutputState,
@@ -318,8 +325,6 @@ fn cat_path(
     if path == "-" {
         let stdin = io::stdin();
         let mut handle = InputHandle {
-            #[cfg(any(target_os = "linux", target_os = "android"))]
-            file_descriptor: stdin.as_raw_fd(),
             reader: stdin,
             is_interactive: atty::is(atty::Stream::Stdin),
         };
@@ -332,8 +337,6 @@ fn cat_path(
             let socket = UnixStream::connect(path)?;
             socket.shutdown(Shutdown::Write)?;
             let mut handle = InputHandle {
-                #[cfg(any(target_os = "linux", target_os = "android"))]
-                file_descriptor: socket.as_raw_fd(),
                 reader: socket,
                 is_interactive: false,
             };
@@ -346,8 +349,6 @@ fn cat_path(
                 return Err(CatError::OutputIsInput);
             }
             let mut handle = InputHandle {
-                #[cfg(any(target_os = "linux", target_os = "android"))]
-                file_descriptor: file.as_raw_fd(),
                 reader: file,
                 is_interactive: false,
             };
@@ -386,7 +387,7 @@ fn cat_files(files: Vec<String>, options: &OutputOptions) -> UResult<()> {
 
     for path in &files {
         if let Err(err) = cat_path(path, options, &mut state, &out_info) {
-            error_messages.push(format!("{}: {}", path, err));
+            error_messages.push(format!("{}: {}", path.maybe_quote(), err));
         }
     }
     if state.skipped_carriage_return {
@@ -436,14 +437,14 @@ fn get_input_type(path: &str) -> CatResult<InputType> {
 
 /// Writes handle to stdout with no configuration. This allows a
 /// simple memory copy.
-fn write_fast<R: Read>(handle: &mut InputHandle<R>) -> CatResult<()> {
+fn write_fast<R: FdReadable>(handle: &mut InputHandle<R>) -> CatResult<()> {
     let stdout = io::stdout();
     let mut stdout_lock = stdout.lock();
     #[cfg(any(target_os = "linux", target_os = "android"))]
     {
         // If we're on Linux or Android, try to use the splice() system call
         // for faster writing. If it works, we're done.
-        if !splice::write_fast_using_splice(handle, stdout_lock.as_raw_fd())? {
+        if !splice::write_fast_using_splice(handle, &stdout_lock)? {
             return Ok(());
         }
     }
@@ -461,7 +462,7 @@ fn write_fast<R: Read>(handle: &mut InputHandle<R>) -> CatResult<()> {
 
 /// Outputs file contents to stdout in a line-by-line fashion,
 /// propagating any errors that might occur.
-fn write_lines<R: Read>(
+fn write_lines<R: FdReadable>(
     handle: &mut InputHandle<R>,
     options: &OutputOptions,
     state: &mut OutputState,

src/uu/cat/src/splice.rs

@@ -1,11 +1,11 @@
-use super::{CatResult, InputHandle};
+use super::{CatResult, FdReadable, InputHandle};
 
-use nix::fcntl::{splice, SpliceFFlags};
-use nix::unistd::{self, pipe};
-use std::fs::File;
-use std::io::Read;
-use std::os::unix::io::{FromRawFd, RawFd};
+use nix::unistd;
+use std::os::unix::io::{AsRawFd, RawFd};
 
+use uucore::pipes::{pipe, splice, splice_exact};
+
+const SPLICE_SIZE: usize = 1024 * 128;
 const BUF_SIZE: usize = 1024 * 16;
 
 /// This function is called from `write_fast()` on Linux and Android. The
@@ -16,36 +16,25 @@ const BUF_SIZE: usize = 1024 * 16;
 /// The `bool` in the result value indicates if we need to fall back to normal
 /// copying or not. False means we don't have to.
 #[inline]
-pub(super) fn write_fast_using_splice<R: Read>(
+pub(super) fn write_fast_using_splice<R: FdReadable>(
     handle: &mut InputHandle<R>,
-    write_fd: RawFd,
+    write_fd: &impl AsRawFd,
 ) -> CatResult<bool> {
     let (pipe_rd, pipe_wr) = pipe()?;
 
-    // Ensure the pipe is closed when the function returns.
-    // SAFETY: The file descriptors do not have other owners.
-    let _handles = unsafe { (File::from_raw_fd(pipe_rd), File::from_raw_fd(pipe_wr)) };
-
     loop {
-        match splice(
-            handle.file_descriptor,
-            None,
-            pipe_wr,
-            None,
-            BUF_SIZE,
-            SpliceFFlags::empty(),
-        ) {
+        match splice(&handle.reader, &pipe_wr, SPLICE_SIZE) {
             Ok(n) => {
                 if n == 0 {
                     return Ok(false);
                 }
-                if splice_exact(pipe_rd, write_fd, n).is_err() {
+                if splice_exact(&pipe_rd, write_fd, n).is_err() {
                     // If the first splice manages to copy to the intermediate
                     // pipe, but the second splice to stdout fails for some reason
                     // we can recover by copying the data that we have from the
                     // intermediate pipe to stdout using normal read/write. Then
                     // we tell the caller to fall back.
-                    copy_exact(pipe_rd, write_fd, n)?;
+                    copy_exact(pipe_rd.as_raw_fd(), write_fd.as_raw_fd(), n)?;
                     return Ok(true);
                 }
             }
@@ -56,35 +45,23 @@ pub(super) fn write_fast_using_splice<R: Read>(
     }
 }
 
-/// Splice wrapper which handles short writes.
-#[inline]
-fn splice_exact(read_fd: RawFd, write_fd: RawFd, num_bytes: usize) -> nix::Result<()> {
-    let mut left = num_bytes;
-    loop {
-        let written = splice(read_fd, None, write_fd, None, left, SpliceFFlags::empty())?;
-        left -= written;
-        if left == 0 {
-            break;
-        }
-    }
-    Ok(())
-}
-
-/// Caller must ensure that `num_bytes <= BUF_SIZE`, otherwise this function
-/// will panic. The way we use this function in `write_fast_using_splice`
-/// above is safe because `splice` is set to write at most `BUF_SIZE` to the
-/// pipe.
-#[inline]
+/// Move exactly `num_bytes` bytes from `read_fd` to `write_fd`.
+///
+/// Panics if not enough bytes can be read.
 fn copy_exact(read_fd: RawFd, write_fd: RawFd, num_bytes: usize) -> nix::Result<()> {
     let mut left = num_bytes;
     let mut buf = [0; BUF_SIZE];
-    loop {
-        let read = unistd::read(read_fd, &mut buf[..left])?;
-        let written = unistd::write(write_fd, &buf[..read])?;
-        left -= written;
-        if left == 0 {
-            break;
+    while left > 0 {
+        let read = unistd::read(read_fd, &mut buf)?;
+        assert_ne!(read, 0, "unexpected end of pipe");
+        let mut written = 0;
+        while written < read {
+            match unistd::write(write_fd, &buf[written..read])? {
+                0 => panic!(),
+                n => written += n,
+            }
         }
+        left -= read;
     }
     Ok(())
 }

src/uu/chcon/src/chcon.rs

@@ -2,7 +2,7 @@
 
 #![allow(clippy::upper_case_acronyms)]
 
-use uucore::{show_error, show_usage_error, show_warning};
+use uucore::{display::Quotable, show_error, show_usage_error, show_warning};
 
 use clap::{App, Arg};
 use selinux::{OpaqueSecurityContext, SecurityContext};
@@ -111,13 +111,13 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                 Ok(context) => context,
 
                 Err(_r) => {
-                    show_error!("Invalid security context '{}'.", context.to_string_lossy());
+                    show_error!("Invalid security context {}.", context.quote());
                     return libc::EXIT_FAILURE;
                 }
             };
 
             if SecurityContext::from_c_str(&c_context, false).check() == Some(false) {
-                show_error!("Invalid security context '{}'.", context.to_string_lossy());
+                show_error!("Invalid security context {}.", context.quote());
                 return libc::EXIT_FAILURE;
             }
 
@@ -281,7 +281,6 @@ pub fn uu_app() -> App<'static, 'static> {
 #[derive(Debug)]
 struct Options {
     verbose: bool,
-    dereference: bool,
     preserve_root: bool,
     recursive_mode: RecursiveMode,
     affect_symlink_referent: bool,
@@ -331,9 +330,6 @@ fn parse_command_line(config: clap::App, args: impl uucore::Args) -> Result<Opti
         (RecursiveMode::NotRecursive, !no_dereference)
     };
 
-    // By default, dereference.
-    let dereference = !matches.is_present(options::dereference::NO_DEREFERENCE);
-
     // By default, do not preserve root.
     let preserve_root = matches.is_present(options::preserve_root::PRESERVE_ROOT);
 
@@ -369,7 +365,6 @@ fn parse_command_line(config: clap::App, args: impl uucore::Args) -> Result<Opti
 
     Ok(Options {
         verbose,
-        dereference,
         preserve_root,
         recursive_mode,
         affect_symlink_referent,
@@ -564,7 +559,7 @@ fn process_file(
             println!(
                 "{}: Changing security context of: {}",
                 uucore::util_name(),
-                file_full_name.to_string_lossy()
+                file_full_name.quote()
             );
         }
 
@@ -699,9 +694,9 @@ fn root_dev_ino_warn(dir_name: &Path) {
         );
     } else {
         show_warning!(
-            "It is dangerous to operate recursively on '{}' (same as '/'). \
+            "It is dangerous to operate recursively on {} (same as '/'). \
              Use --{} to override this failsafe.",
-            dir_name.to_string_lossy(),
+            dir_name.quote(),
             options::preserve_root::NO_PRESERVE_ROOT,
         );
     }
@@ -726,8 +721,8 @@ fn emit_cycle_warning(file_name: &Path) {
         "Circular directory structure.\n\
 This almost certainly means that you have a corrupted file system.\n\
 NOTIFY YOUR SYSTEM MANAGER.\n\
-The following directory is part of the cycle '{}'.",
-        file_name.display()
+The following directory is part of the cycle {}.",
+        file_name.quote()
     )
 }
 

src/uu/chcon/src/errors.rs

@@ -2,6 +2,8 @@ use std::ffi::OsString;
 use std::fmt::Write;
 use std::io;
 
+use uucore::display::Quotable;
+
 pub(crate) type Result<T> = std::result::Result<T, Error>;
 
 #[derive(thiserror::Error, Debug)]
@@ -30,7 +32,7 @@ pub(crate) enum Error {
         source: io::Error,
     },
 
-    #[error("{operation} failed on '{}'", .operand1.to_string_lossy())]
+    #[error("{operation} failed on {}", .operand1.quote())]
     Io1 {
         operation: &'static str,
         operand1: OsString,

src/uu/chgrp/src/chgrp.rs

@@ -9,6 +9,7 @@
 
 #[macro_use]
 extern crate uucore;
+use uucore::display::Quotable;
 pub use uucore::entries;
 use uucore::error::{FromIo, UResult, USimpleError};
 use uucore::perms::{chown_base, options, IfFrom};
@@ -32,7 +33,7 @@ fn parse_gid_and_uid(matches: &ArgMatches) -> UResult<(Option<u32>, Option<u32>,
     let dest_gid = if let Some(file) = matches.value_of(options::REFERENCE) {
         fs::metadata(&file)
             .map(|meta| Some(meta.gid()))
-            .map_err_context(|| format!("failed to get attributes of '{}'", file))?
+            .map_err_context(|| format!("failed to get attributes of {}", file.quote()))?
     } else {
         let group = matches.value_of(options::ARG_GROUP).unwrap_or_default();
         if group.is_empty() {
@@ -40,7 +41,12 @@ fn parse_gid_and_uid(matches: &ArgMatches) -> UResult<(Option<u32>, Option<u32>,
         } else {
             match entries::grp2gid(group) {
                 Ok(g) => Some(g),
-                _ => return Err(USimpleError::new(1, format!("invalid group: '{}'", group))),
+                _ => {
+                    return Err(USimpleError::new(
+                        1,
+                        format!("invalid group: {}", group.quote()),
+                    ))
+                }
             }
         }
     };

src/uu/chmod/src/chmod.rs

@@ -14,6 +14,7 @@ use clap::{crate_version, App, Arg};
 use std::fs;
 use std::os::unix::fs::{MetadataExt, PermissionsExt};
 use std::path::Path;
+use uucore::display::Quotable;
 use uucore::fs::display_permissions_unix;
 use uucore::libc::mode_t;
 #[cfg(not(windows))]
@@ -75,7 +76,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         .value_of(options::REFERENCE)
         .and_then(|fref| match fs::metadata(fref) {
             Ok(meta) => Some(meta.mode()),
-            Err(err) => crash!(1, "cannot stat attributes of '{}': {}", fref, err),
+            Err(err) => crash!(1, "cannot stat attributes of {}: {}", fref.quote(), err),
         });
     let modes = matches.value_of(options::MODE).unwrap(); // should always be Some because required
     let cmode = if mode_had_minus_prefix {
@@ -223,21 +224,24 @@ impl Chmoder {
             if !file.exists() {
                 if is_symlink(file) {
                     println!(
-                        "failed to change mode of '{}' from 0000 (---------) to 0000 (---------)",
-                        filename
+                        "failed to change mode of {} from 0000 (---------) to 0000 (---------)",
+                        filename.quote()
                     );
                     if !self.quiet {
-                        show_error!("cannot operate on dangling symlink '{}'", filename);
+                        show_error!("cannot operate on dangling symlink {}", filename.quote());
                     }
                 } else if !self.quiet {
-                    show_error!("cannot access '{}': No such file or directory", filename);
+                    show_error!(
+                        "cannot access {}: No such file or directory",
+                        filename.quote()
+                    );
                 }
                 return Err(1);
             }
             if self.recursive && self.preserve_root && filename == "/" {
                 show_error!(
-                    "it is dangerous to operate recursively on '{}'\nuse --no-preserve-root to override this failsafe",
-                    filename
+                    "it is dangerous to operate recursively on {}\nuse --no-preserve-root to override this failsafe",
+                    filename.quote()
                 );
                 return Err(1);
             }
@@ -270,15 +274,17 @@ impl Chmoder {
                 if is_symlink(file) {
                     if self.verbose {
                         println!(
-                            "neither symbolic link '{}' nor referent has been changed",
-                            file.display()
+                            "neither symbolic link {} nor referent has been changed",
+                            file.quote()
                         );
                     }
                     return Ok(());
                 } else if err.kind() == std::io::ErrorKind::PermissionDenied {
-                    show_error!("'{}': Permission denied", file.display());
+                    // These two filenames would normally be conditionally
+                    // quoted, but GNU's tests expect them to always be quoted
+                    show_error!("{}: Permission denied", file.quote());
                 } else {
-                    show_error!("'{}': {}", file.display(), err);
+                    show_error!("{}: {}", file.quote(), err);
                 }
                 return Err(1);
             }
@@ -325,7 +331,7 @@ impl Chmoder {
                 if (new_mode & !naively_expected_new_mode) != 0 {
                     show_error!(
                         "{}: new permissions are {}, not {}",
-                        file.display(),
+                        file.maybe_quote(),
                         display_permissions_unix(new_mode as mode_t, false),
                         display_permissions_unix(naively_expected_new_mode as mode_t, false)
                     );
@@ -342,8 +348,8 @@ impl Chmoder {
         if fperm == mode {
             if self.verbose && !self.changes {
                 println!(
-                    "mode of '{}' retained as {:04o} ({})",
-                    file.display(),
+                    "mode of {} retained as {:04o} ({})",
+                    file.quote(),
                     fperm,
                     display_permissions_unix(fperm as mode_t, false),
                 );
@@ -355,8 +361,8 @@ impl Chmoder {
             }
             if self.verbose {
                 println!(
-                    "failed to change mode of file '{}' from {:04o} ({}) to {:04o} ({})",
-                    file.display(),
+                    "failed to change mode of file {} from {:04o} ({}) to {:04o} ({})",
+                    file.quote(),
                     fperm,
                     display_permissions_unix(fperm as mode_t, false),
                     mode,
@@ -367,8 +373,8 @@ impl Chmoder {
         } else {
             if self.verbose || self.changes {
                 println!(
-                    "mode of '{}' changed from {:04o} ({}) to {:04o} ({})",
-                    file.display(),
+                    "mode of {} changed from {:04o} ({}) to {:04o} ({})",
+                    file.quote(),
                     fperm,
                     display_permissions_unix(fperm as mode_t, false),
                     mode,

src/uu/chown/src/chown.rs

@@ -5,10 +5,11 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-// spell-checker:ignore (ToDO) COMFOLLOW Passwd RFILE RFILE's derefer dgid duid
+// spell-checker:ignore (ToDO) COMFOLLOW Passwd RFILE RFILE's derefer dgid duid groupname
 
 #[macro_use]
 extern crate uucore;
+use uucore::display::Quotable;
 pub use uucore::entries::{self, Group, Locate, Passwd};
 use uucore::perms::{chown_base, options, IfFrom};
 
@@ -30,7 +31,7 @@ fn get_usage() -> String {
 
 fn parse_gid_uid_and_filter(matches: &ArgMatches) -> UResult<(Option<u32>, Option<u32>, IfFrom)> {
     let filter = if let Some(spec) = matches.value_of(options::FROM) {
-        match parse_spec(spec)? {
+        match parse_spec(spec, ':')? {
             (Some(uid), None) => IfFrom::User(uid),
             (None, Some(gid)) => IfFrom::Group(gid),
             (Some(uid), Some(gid)) => IfFrom::UserGroup(uid, gid),
@@ -44,11 +45,11 @@ fn parse_gid_uid_and_filter(matches: &ArgMatches) -> UResult<(Option<u32>, Optio
     let dest_gid: Option<u32>;
     if let Some(file) = matches.value_of(options::REFERENCE) {
         let meta = fs::metadata(&file)
-            .map_err_context(|| format!("failed to get attributes of '{}'", file))?;
+            .map_err_context(|| format!("failed to get attributes of {}", file.quote()))?;
         dest_gid = Some(meta.gid());
         dest_uid = Some(meta.uid());
     } else {
-        let (u, g) = parse_spec(matches.value_of(options::ARG_OWNER).unwrap())?;
+        let (u, g) = parse_spec(matches.value_of(options::ARG_OWNER).unwrap(), ':')?;
         dest_uid = u;
         dest_gid = g;
     }
@@ -165,24 +166,50 @@ pub fn uu_app() -> App<'static, 'static> {
         )
 }
 
-fn parse_spec(spec: &str) -> UResult<(Option<u32>, Option<u32>)> {
-    let args = spec.split_terminator(':').collect::<Vec<_>>();
-    let usr_only = args.len() == 1 && !args[0].is_empty();
-    let grp_only = args.len() == 2 && args[0].is_empty();
-    let usr_grp = args.len() == 2 && !args[0].is_empty() && !args[1].is_empty();
-    let uid = if usr_only || usr_grp {
-        Some(
-            Passwd::locate(args[0])
-                .map_err(|_| USimpleError::new(1, format!("invalid user: '{}'", spec)))?
-                .uid(),
-        )
+/// Parse the username and groupname
+///
+/// In theory, it should be username:groupname
+/// but ...
+/// it can user.name:groupname
+/// or username.groupname
+///
+/// # Arguments
+///
+/// * `spec` - The input from the user
+/// * `sep` - Should be ':' or '.'
+fn parse_spec(spec: &str, sep: char) -> UResult<(Option<u32>, Option<u32>)> {
+    assert!(['.', ':'].contains(&sep));
+    let mut args = spec.splitn(2, sep);
+    let user = args.next().unwrap_or("");
+    let group = args.next().unwrap_or("");
+
+    let uid = if !user.is_empty() {
+        Some(match Passwd::locate(user) {
+            Ok(u) => u.uid(), // We have been able to get the uid
+            Err(_) =>
+            // we have NOT been able to find the uid
+            // but we could be in the case where we have user.group
+            {
+                if spec.contains('.') && !spec.contains(':') && sep == ':' {
+                    // but the input contains a '.' but not a ':'
+                    // we might have something like username.groupname
+                    // So, try to parse it this way
+                    return parse_spec(spec, '.');
+                } else {
+                    return Err(USimpleError::new(
+                        1,
+                        format!("invalid user: {}", spec.quote()),
+                    ));
+                }
+            }
+        })
     } else {
         None
     };
-    let gid = if grp_only || usr_grp {
+    let gid = if !group.is_empty() {
         Some(
-            Group::locate(args[1])
-                .map_err(|_| USimpleError::new(1, format!("invalid group: '{}'", spec)))?
+            Group::locate(group)
+                .map_err(|_| USimpleError::new(1, format!("invalid group: {}", spec.quote())))?
                 .gid(),
         )
     } else {
@@ -197,7 +224,10 @@ mod test {
 
     #[test]
     fn test_parse_spec() {
-        assert!(matches!(parse_spec(":"), Ok((None, None))));
-        assert!(format!("{}", parse_spec("::").err().unwrap()).starts_with("invalid group: "));
+        assert!(matches!(parse_spec(":", ':'), Ok((None, None))));
+        assert!(matches!(parse_spec(".", ':'), Ok((None, None))));
+        assert!(matches!(parse_spec(".", '.'), Ok((None, None))));
+        assert!(format!("{}", parse_spec("::", ':').err().unwrap()).starts_with("invalid group: "));
+        assert!(format!("{}", parse_spec("..", ':').err().unwrap()).starts_with("invalid group: "));
     }
 }

src/uu/chroot/src/chroot.rs

@@ -15,6 +15,7 @@ use std::ffi::CString;
 use std::io::Error;
 use std::path::Path;
 use std::process::Command;
+use uucore::display::Quotable;
 use uucore::libc::{self, chroot, setgid, setgroups, setuid};
 use uucore::{entries, InvalidEncodingHandling};
 
@@ -53,8 +54,8 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     if !newroot.is_dir() {
         crash!(
             1,
-            "cannot change root directory to `{}`: no such directory",
-            newroot.display()
+            "cannot change root directory to {}: no such directory",
+            newroot.quote()
         );
     }
 
@@ -149,7 +150,7 @@ fn set_context(root: &Path, options: &clap::ArgMatches) {
         Some(u) => {
             let s: Vec<&str> = u.split(':').collect();
             if s.len() != 2 || s.iter().any(|&spec| spec.is_empty()) {
-                crash!(1, "invalid userspec: `{}`", u)
+                crash!(1, "invalid userspec: {}", u.quote())
             };
             s
         }
@@ -170,7 +171,6 @@ fn set_context(root: &Path, options: &clap::ArgMatches) {
 }
 
 fn enter_chroot(root: &Path) {
-    let root_str = root.display();
     std::env::set_current_dir(root).unwrap();
     let err = unsafe {
         chroot(CString::new(".").unwrap().as_bytes_with_nul().as_ptr() as *const libc::c_char)
@@ -179,7 +179,7 @@ fn enter_chroot(root: &Path) {
         crash!(
             1,
             "cannot chroot to {}: {}",
-            root_str,
+            root.quote(),
             Error::last_os_error()
         )
     };
@@ -189,7 +189,7 @@ fn set_main_group(group: &str) {
     if !group.is_empty() {
         let group_id = match entries::grp2gid(group) {
             Ok(g) => g,
-            _ => crash!(1, "no such group: {}", group),
+            _ => crash!(1, "no such group: {}", group.maybe_quote()),
         };
         let err = unsafe { setgid(group_id) };
         if err != 0 {
@@ -234,7 +234,12 @@ fn set_user(user: &str) {
         let user_id = entries::usr2uid(user).unwrap();
         let err = unsafe { setuid(user_id as libc::uid_t) };
         if err != 0 {
-            crash!(1, "cannot set user to {}: {}", user, Error::last_os_error())
+            crash!(
+                1,
+                "cannot set user to {}: {}",
+                user.maybe_quote(),
+                Error::last_os_error()
+            )
         }
     }
 }

src/uu/cksum/src/cksum.rs

@@ -14,6 +14,7 @@ use clap::{crate_version, App, Arg};
 use std::fs::File;
 use std::io::{self, stdin, BufReader, Read};
 use std::path::Path;
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 // NOTE: CRC_TABLE_LEN *must* be <= 256 as we cast 0..CRC_TABLE_LEN to u8
@@ -191,7 +192,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         match cksum("-") {
             Ok((crc, size)) => println!("{} {}", crc, size),
             Err(err) => {
-                show_error!("{}", err);
+                show_error!("-: {}", err);
                 return 2;
             }
         }
@@ -203,7 +204,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         match cksum(fname.as_ref()) {
             Ok((crc, size)) => println!("{} {} {}", crc, size, fname),
             Err(err) => {
-                show_error!("'{}' {}", fname, err);
+                show_error!("{}: {}", fname.maybe_quote(), err);
                 exit_code = 2;
             }
         }

src/uu/cp/src/cp.rs

@@ -18,6 +18,7 @@ extern crate quick_error;
 #[macro_use]
 extern crate uucore;
 
+use uucore::display::Quotable;
 #[cfg(windows)]
 use winapi::um::fileapi::CreateFileW;
 #[cfg(windows)]
@@ -541,8 +542,8 @@ impl FromStr for Attribute {
             "xattr" => Attribute::Xattr,
             _ => {
                 return Err(Error::InvalidArgument(format!(
-                    "invalid attribute '{}'",
-                    value
+                    "invalid attribute {}",
+                    value.quote()
                 )));
             }
         })
@@ -659,8 +660,8 @@ impl Options {
                         "never" => ReflinkMode::Never,
                         value => {
                             return Err(Error::InvalidArgument(format!(
-                                "invalid argument '{}' for \'reflink\'",
-                                value
+                                "invalid argument {} for \'reflink\'",
+                                value.quote()
                             )));
                         }
                     }
@@ -832,7 +833,7 @@ fn copy(sources: &[Source], target: &TargetSlice, options: &Options) -> CopyResu
     let mut seen_sources = HashSet::with_capacity(sources.len());
     for source in sources {
         if seen_sources.contains(source) {
-            show_warning!("source '{}' specified more than once", source.display());
+            show_warning!("source {} specified more than once", source.quote());
         } else {
             let mut found_hard_link = false;
             if preserve_hard_links {
@@ -873,8 +874,8 @@ fn construct_dest_path(
 ) -> CopyResult<PathBuf> {
     if options.no_target_dir && target.is_dir() {
         return Err(format!(
-            "cannot overwrite directory '{}' with non-directory",
-            target.display()
+            "cannot overwrite directory {} with non-directory",
+            target.quote()
         )
         .into());
     }
@@ -941,7 +942,7 @@ fn adjust_canonicalization(p: &Path) -> Cow<Path> {
 /// will not cause a short-circuit.
 fn copy_directory(root: &Path, target: &TargetSlice, options: &Options) -> CopyResult<()> {
     if !options.recursive {
-        return Err(format!("omitting directory '{}'", root.display()).into());
+        return Err(format!("omitting directory {}", root.quote()).into());
     }
 
     // if no-dereference is enabled and this is a symlink, copy it as a file
@@ -1041,12 +1042,12 @@ impl OverwriteMode {
         match *self {
             OverwriteMode::NoClobber => Err(Error::NotAllFilesCopied),
             OverwriteMode::Interactive(_) => {
-                if prompt_yes!("{}: overwrite {}? ", uucore::util_name(), path.display()) {
+                if prompt_yes!("{}: overwrite {}? ", uucore::util_name(), path.quote()) {
                     Ok(())
                 } else {
                     Err(Error::Skipped(format!(
                         "Not overwriting {} at user request",
-                        path.display()
+                        path.quote()
                     )))
                 }
             }
@@ -1056,7 +1057,7 @@ impl OverwriteMode {
 }
 
 fn copy_attribute(source: &Path, dest: &Path, attribute: &Attribute) -> CopyResult<()> {
-    let context = &*format!("'{}' -> '{}'", source.display().to_string(), dest.display());
+    let context = &*format!("{} -> {}", source.quote(), dest.quote());
     let source_metadata = fs::symlink_metadata(source).context(context)?;
     match *attribute {
         Attribute::Mode => {
@@ -1152,7 +1153,7 @@ fn symlink_file(source: &Path, dest: &Path, context: &str) -> CopyResult<()> {
 }
 
 fn context_for(src: &Path, dest: &Path) -> String {
-    format!("'{}' -> '{}'", src.display(), dest.display())
+    format!("{} -> {}", src.quote(), dest.quote())
 }
 
 /// Implements a simple backup copy for the destination file.
@@ -1332,8 +1333,8 @@ fn copy_link(source: &Path, dest: &Path) -> CopyResult<()> {
             Some(name) => dest.join(name).into(),
             None => crash!(
                 EXIT_ERR,
-                "cannot stat '{}': No such file or directory",
-                source.display()
+                "cannot stat {}: No such file or directory",
+                source.quote()
             ),
         }
     } else {
@@ -1454,11 +1455,11 @@ fn copy_on_write_macos(
 pub fn verify_target_type(target: &Path, target_type: &TargetType) -> CopyResult<()> {
     match (target_type, target.is_dir()) {
         (&TargetType::Directory, false) => {
-            Err(format!("target: '{}' is not a directory", target.display()).into())
+            Err(format!("target: {} is not a directory", target.quote()).into())
         }
         (&TargetType::File, true) => Err(format!(
-            "cannot overwrite directory '{}' with non-directory",
-            target.display()
+            "cannot overwrite directory {} with non-directory",
+            target.quote()
         )
         .into()),
         _ => Ok(()),

src/uu/csplit/src/csplit.rs

@@ -10,6 +10,7 @@ use std::{
     fs::{remove_file, File},
     io::{BufRead, BufWriter, Write},
 };
+use uucore::display::Quotable;
 
 mod csplit_error;
 mod patterns;
@@ -734,7 +735,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         let file = crash_if_err!(1, File::open(file_name));
         let file_metadata = crash_if_err!(1, file.metadata());
         if !file_metadata.is_file() {
-            crash!(1, "'{}' is not a regular file", file_name);
+            crash!(1, "{} is not a regular file", file_name.quote());
         }
         crash_if_err!(1, csplit(&options, patterns, BufReader::new(file)));
     };

src/uu/csplit/src/csplit_error.rs

@@ -1,26 +1,28 @@
 use std::io;
 use thiserror::Error;
 
+use uucore::display::Quotable;
+
 /// Errors thrown by the csplit command
 #[derive(Debug, Error)]
 pub enum CsplitError {
     #[error("IO error: {}", _0)]
     IoError(io::Error),
-    #[error("'{}': line number out of range", _0)]
+    #[error("{}: line number out of range", ._0.quote())]
     LineOutOfRange(String),
-    #[error("'{}': line number out of range on repetition {}", _0, _1)]
+    #[error("{}: line number out of range on repetition {}", ._0.quote(), _1)]
     LineOutOfRangeOnRepetition(String, usize),
-    #[error("'{}': match not found", _0)]
+    #[error("{}: match not found", ._0.quote())]
     MatchNotFound(String),
-    #[error("'{}': match not found on repetition {}", _0, _1)]
+    #[error("{}: match not found on repetition {}", ._0.quote(), _1)]
     MatchNotFoundOnRepetition(String, usize),
     #[error("line number must be greater than zero")]
     LineNumberIsZero,
     #[error("line number '{}' is smaller than preceding line number, {}", _0, _1)]
     LineNumberSmallerThanPrevious(usize, usize),
-    #[error("invalid pattern: {}", _0)]
+    #[error("{}: invalid pattern", ._0.quote())]
     InvalidPattern(String),
-    #[error("invalid number: '{}'", _0)]
+    #[error("invalid number: {}", ._0.quote())]
     InvalidNumber(String),
     #[error("incorrect conversion specification in suffix")]
     SuffixFormatIncorrect,

src/uu/cut/src/cut.rs

@@ -15,6 +15,7 @@ use clap::{crate_version, App, Arg};
 use std::fs::File;
 use std::io::{stdin, stdout, BufReader, BufWriter, Read, Write};
 use std::path::Path;
+use uucore::display::Quotable;
 
 use self::searcher::Searcher;
 use uucore::ranges::Range;
@@ -351,19 +352,19 @@ fn cut_files(mut filenames: Vec<String>, mode: Mode) -> i32 {
             let path = Path::new(&filename[..]);
 
             if path.is_dir() {
-                show_error!("{}: Is a directory", filename);
+                show_error!("{}: Is a directory", filename.maybe_quote());
                 continue;
             }
 
             if path.metadata().is_err() {
-                show_error!("{}: No such file or directory", filename);
+                show_error!("{}: No such file or directory", filename.maybe_quote());
                 continue;
             }
 
             let file = match File::open(&path) {
                 Ok(f) => f,
                 Err(e) => {
-                    show_error!("opening '{}': {}", &filename[..], e);
+                    show_error!("opening {}: {}", filename.quote(), e);
                     continue;
                 }
             };

src/uu/date/src/date.rs

@@ -17,6 +17,8 @@ use libc::{clock_settime, timespec, CLOCK_REALTIME};
 use std::fs::File;
 use std::io::{BufRead, BufReader};
 use std::path::PathBuf;
+use uucore::display::Quotable;
+use uucore::show_error;
 #[cfg(windows)]
 use winapi::{
     shared::minwindef::WORD,
@@ -145,7 +147,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
 
     let format = if let Some(form) = matches.value_of(OPT_FORMAT) {
         if !form.starts_with('+') {
-            eprintln!("date: invalid date '{}'", form);
+            show_error!("invalid date {}", form.quote());
             return 1;
         }
         let form = form[1..].to_string();
@@ -174,7 +176,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     let set_to = match matches.value_of(OPT_SET).map(parse_date) {
         None => None,
         Some(Err((input, _err))) => {
-            eprintln!("date: invalid date '{}'", input);
+            show_error!("invalid date {}", input.quote());
             return 1;
         }
         Some(Ok(date)) => Some(date),
@@ -240,7 +242,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                     println!("{}", formatted);
                 }
                 Err((input, _err)) => {
-                    println!("date: invalid date '{}'", input);
+                    show_error!("invalid date {}", input.quote());
                 }
             }
         }
@@ -352,13 +354,13 @@ fn set_system_datetime(_date: DateTime<Utc>) -> i32 {
 
 #[cfg(target_os = "macos")]
 fn set_system_datetime(_date: DateTime<Utc>) -> i32 {
-    eprintln!("date: setting the date is not supported by macOS");
+    show_error!("setting the date is not supported by macOS");
     1
 }
 
 #[cfg(target_os = "redox")]
 fn set_system_datetime(_date: DateTime<Utc>) -> i32 {
-    eprintln!("date: setting the date is not supported by Redox");
+    show_error!("setting the date is not supported by Redox");
     1
 }
 
@@ -378,7 +380,7 @@ fn set_system_datetime(date: DateTime<Utc>) -> i32 {
 
     if result != 0 {
         let error = std::io::Error::last_os_error();
-        eprintln!("date: cannot set date: {}", error);
+        show_error!("cannot set date: {}", error);
         error.raw_os_error().unwrap()
     } else {
         0
@@ -408,7 +410,7 @@ fn set_system_datetime(date: DateTime<Utc>) -> i32 {
 
     if result == 0 {
         let error = std::io::Error::last_os_error();
-        eprintln!("date: cannot set date: {}", error);
+        show_error!("cannot set date: {}", error);
         error.raw_os_error().unwrap()
     } else {
         0

src/uu/dircolors/src/dircolors.rs

@@ -17,6 +17,7 @@ use std::fs::File;
 use std::io::{BufRead, BufReader};
 
 use clap::{crate_version, App, Arg};
+use uucore::display::Quotable;
 
 mod options {
     pub const BOURNE_SHELL: &str = "bourne-shell";
@@ -94,9 +95,9 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     if matches.is_present(options::PRINT_DATABASE) {
         if !files.is_empty() {
             show_usage_error!(
-                "extra operand '{}'\nfile operands cannot be combined with \
+                "extra operand {}\nfile operands cannot be combined with \
                  --print-database (-p)",
-                files[0]
+                files[0].quote()
             );
             return 1;
         }
@@ -126,7 +127,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         result = parse(INTERNAL_DB.lines(), out_format, "")
     } else {
         if files.len() > 1 {
-            show_usage_error!("extra operand '{}'", files[1]);
+            show_usage_error!("extra operand {}", files[1].quote());
             return 1;
         }
         match File::open(files[0]) {
@@ -135,7 +136,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                 result = parse(fin.lines().filter_map(Result::ok), out_format, files[0])
             }
             Err(e) => {
-                show_error!("{}: {}", files[0], e);
+                show_error!("{}: {}", files[0].maybe_quote(), e);
                 return 1;
             }
         }
@@ -314,7 +315,8 @@ where
         if val.is_empty() {
             return Err(format!(
                 "{}:{}: invalid line;  missing second token",
-                fp, num
+                fp.maybe_quote(),
+                num
             ));
         }
         let lower = key.to_lowercase();
@@ -341,7 +343,12 @@ where
                 } else if let Some(s) = table.get(lower.as_str()) {
                     result.push_str(format!("{}={}:", s, val).as_str());
                 } else {
-                    return Err(format!("{}:{}: unrecognized keyword {}", fp, num, key));
+                    return Err(format!(
+                        "{}:{}: unrecognized keyword {}",
+                        fp.maybe_quote(),
+                        num,
+                        key
+                    ));
                 }
             }
         }

src/uu/dirname/src/dirname.rs

@@ -10,6 +10,7 @@ extern crate uucore;
 
 use clap::{crate_version, App, Arg};
 use std::path::Path;
+use uucore::display::print_verbatim;
 use uucore::error::{UResult, UUsageError};
 use uucore::InvalidEncodingHandling;
 
@@ -65,7 +66,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                     if d.components().next() == None {
                         print!(".")
                     } else {
-                        print!("{}", d.to_string_lossy());
+                        print_verbatim(d).unwrap();
                     }
                 }
                 None => {

src/uu/du/src/du.rs

@@ -32,6 +32,7 @@ use std::path::PathBuf;
 use std::str::FromStr;
 use std::time::{Duration, UNIX_EPOCH};
 use std::{error::Error, fmt::Display};
+use uucore::display::{print_verbatim, Quotable};
 use uucore::error::{UError, UResult};
 use uucore::parse_size::{parse_size, ParseSizeError};
 use uucore::InvalidEncodingHandling;
@@ -293,9 +294,9 @@ fn du(
             Err(e) => {
                 safe_writeln!(
                     stderr(),
-                    "{}: cannot read directory '{}': {}",
+                    "{}: cannot read directory {}: {}",
                     options.util_name,
-                    my_stat.path.display(),
+                    my_stat.path.quote(),
                     e
                 );
                 return Box::new(iter::once(my_stat));
@@ -334,11 +335,11 @@ fn du(
                     }
                     Err(error) => match error.kind() {
                         ErrorKind::PermissionDenied => {
-                            let description = format!("cannot access '{}'", entry.path().display());
+                            let description = format!("cannot access {}", entry.path().quote());
                             let error_message = "Permission denied";
                             show_error_custom_description!(description, "{}", error_message)
                         }
-                        _ => show_error!("cannot access '{}': {}", entry.path().display(), error),
+                        _ => show_error!("cannot access {}: {}", entry.path().quote(), error),
                     },
                 },
                 Err(error) => show_error!("{}", error),
@@ -411,26 +412,30 @@ enum DuError {
 impl Display for DuError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            DuError::InvalidMaxDepthArg(s) => write!(f, "invalid maximum depth '{}'", s),
+            DuError::InvalidMaxDepthArg(s) => write!(f, "invalid maximum depth {}", s.quote()),
             DuError::SummarizeDepthConflict(s) => {
-                write!(f, "summarizing conflicts with --max-depth={}", s)
+                write!(
+                    f,
+                    "summarizing conflicts with --max-depth={}",
+                    s.maybe_quote()
+                )
             }
             DuError::InvalidTimeStyleArg(s) => write!(
                 f,
-                "invalid argument '{}' for 'time style'
+                "invalid argument {} for 'time style'
 Valid arguments are:
 - 'full-iso'
 - 'long-iso'
 - 'iso'
 Try '{} --help' for more information.",
-                s,
+                s.quote(),
                 uucore::execution_phrase()
             ),
             DuError::InvalidTimeArg(s) => write!(
                 f,
-                "Invalid argument '{}' for --time.
+                "Invalid argument {} for --time.
 'birth' and 'creation' arguments are not supported on this platform.",
-                s
+                s.quote()
             ),
         }
     }
@@ -466,7 +471,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
     let options = Options {
         all: matches.is_present(options::ALL),
-        util_name: uucore::util_name(),
+        util_name: uucore::util_name().to_owned(),
         max_depth,
         total: matches.is_present(options::TOTAL),
         separate_dirs: matches.is_present(options::SEPARATE_DIRS),
@@ -566,21 +571,14 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                         };
                         if !summarize || index == len - 1 {
                             let time_str = tm.format(time_format_str).to_string();
-                            print!(
-                                "{}\t{}\t{}{}",
-                                convert_size(size),
-                                time_str,
-                                stat.path.display(),
-                                line_separator
-                            );
+                            print!("{}\t{}\t", convert_size(size), time_str);
+                            print_verbatim(stat.path).unwrap();
+                            print!("{}", line_separator);
                         }
                     } else if !summarize || index == len - 1 {
-                        print!(
-                            "{}\t{}{}",
-                            convert_size(size),
-                            stat.path.display(),
-                            line_separator
-                        );
+                        print!("{}\t", convert_size(size));
+                        print_verbatim(stat.path).unwrap();
+                        print!("{}", line_separator);
                     }
                     if options.total && index == (len - 1) {
                         // The last element will be the total size of the the path under
@@ -590,7 +588,11 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                 }
             }
             Err(_) => {
-                show_error!("{}: {}", path_string, "No such file or directory");
+                show_error!(
+                    "{}: {}",
+                    path_string.maybe_quote(),
+                    "No such file or directory"
+                );
             }
         }
     }
@@ -837,8 +839,8 @@ fn format_error_message(error: ParseSizeError, s: &str, option: &str) -> String
     // GNU's du echos affected flag, -B or --block-size (-t or --threshold), depending user's selection
     // GNU's du does distinguish between "invalid (suffix in) argument"
     match error {
-        ParseSizeError::ParseFailure(_) => format!("invalid --{} argument '{}'", option, s),
-        ParseSizeError::SizeTooBig(_) => format!("--{} argument '{}' too large", option, s),
+        ParseSizeError::ParseFailure(_) => format!("invalid --{} argument {}", option, s.quote()),
+        ParseSizeError::SizeTooBig(_) => format!("--{} argument {} too large", option, s.quote()),
     }
 }
 

src/uu/env/src/env.rs

@@ -22,6 +22,7 @@ use std::env;
 use std::io::{self, Write};
 use std::iter::Iterator;
 use std::process::Command;
+use uucore::display::Quotable;
 use uucore::error::{UResult, USimpleError};
 
 const USAGE: &str = "env [OPTION]... [-] [NAME=VALUE]... [COMMAND [ARG]...]";
@@ -65,8 +66,14 @@ fn parse_name_value_opt<'a>(opts: &mut Options<'a>, opt: &'a str) -> Result<bool
 
 fn parse_program_opt<'a>(opts: &mut Options<'a>, opt: &'a str) -> Result<(), i32> {
     if opts.null {
-        eprintln!("{}: cannot specify --null (-0) with command", crate_name!());
-        eprintln!("Type \"{} --help\" for detailed information", crate_name!());
+        eprintln!(
+            "{}: cannot specify --null (-0) with command",
+            uucore::util_name()
+        );
+        eprintln!(
+            "Type \"{} --help\" for detailed information",
+            uucore::execution_phrase()
+        );
         Err(1)
     } else {
         opts.program.push(opt);
@@ -87,7 +94,7 @@ fn load_config_file(opts: &mut Options) -> UResult<()> {
         };
 
         let conf = conf.map_err(|error| {
-            eprintln!("env: error: \"{}\": {}", file, error);
+            show_error!("{}: {}", file.maybe_quote(), error);
             1
         })?;
 

src/uu/expand/src/expand.rs

@@ -17,6 +17,7 @@ use std::fs::File;
 use std::io::{stdin, stdout, BufRead, BufReader, BufWriter, Read, Write};
 use std::str::from_utf8;
 use unicode_width::UnicodeWidthChar;
+use uucore::display::Quotable;
 
 static ABOUT: &str = "Convert tabs in each FILE to spaces, writing to standard output.
  With no FILE, or when FILE is -, read standard input.";
@@ -216,7 +217,7 @@ fn open(path: String) -> BufReader<Box<dyn Read + 'static>> {
     } else {
         file_buf = match File::open(&path[..]) {
             Ok(a) => a,
-            Err(e) => crash!(1, "{}: {}\n", &path[..], e),
+            Err(e) => crash!(1, "{}: {}\n", path.maybe_quote(), e),
         };
         BufReader::new(Box::new(file_buf) as Box<dyn Read>)
     }

src/uu/factor/src/cli.rs

@@ -16,6 +16,7 @@ use std::io::{self, stdin, stdout, BufRead, Write};
 mod factor;
 use clap::{crate_version, App, Arg};
 pub use factor::*;
+use uucore::display::Quotable;
 
 mod miller_rabin;
 pub mod numeric;
@@ -52,7 +53,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     if let Some(values) = matches.values_of(options::NUMBER) {
         for number in values {
             if let Err(e) = print_factors_str(number, &mut w, &mut factors_buffer) {
-                show_warning!("{}: {}", number, e);
+                show_warning!("{}: {}", number.maybe_quote(), e);
             }
         }
     } else {
@@ -61,7 +62,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         for line in stdin.lock().lines() {
             for number in line.unwrap().split_whitespace() {
                 if let Err(e) = print_factors_str(number, &mut w, &mut factors_buffer) {
-                    show_warning!("{}: {}", number, e);
+                    show_warning!("{}: {}", number.maybe_quote(), e);
                 }
             }
         }

src/uu/fmt/src/fmt.rs

@@ -15,6 +15,7 @@ use std::cmp;
 use std::fs::File;
 use std::io::{stdin, stdout, Write};
 use std::io::{BufReader, BufWriter, Read};
+use uucore::display::Quotable;
 
 use self::linebreak::break_lines;
 use self::parasplit::ParagraphStream;
@@ -132,7 +133,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         fmt_opts.width = match s.parse::<usize>() {
             Ok(t) => t,
             Err(e) => {
-                crash!(1, "Invalid WIDTH specification: `{}': {}", s, e);
+                crash!(1, "Invalid WIDTH specification: {}: {}", s.quote(), e);
             }
         };
         if fmt_opts.width > MAX_WIDTH {
@@ -149,7 +150,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         fmt_opts.goal = match s.parse::<usize>() {
             Ok(t) => t,
             Err(e) => {
-                crash!(1, "Invalid GOAL specification: `{}': {}", s, e);
+                crash!(1, "Invalid GOAL specification: {}: {}", s.quote(), e);
             }
         };
         if !matches.is_present(OPT_WIDTH) {
@@ -163,7 +164,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         fmt_opts.tabwidth = match s.parse::<usize>() {
             Ok(t) => t,
             Err(e) => {
-                crash!(1, "Invalid TABWIDTH specification: `{}': {}", s, e);
+                crash!(1, "Invalid TABWIDTH specification: {}: {}", s.quote(), e);
             }
         };
     };
@@ -187,7 +188,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
             _ => match File::open(i) {
                 Ok(f) => BufReader::new(Box::new(f) as Box<dyn Read + 'static>),
                 Err(e) => {
-                    show_warning!("{}: {}", i, e);
+                    show_warning!("{}: {}", i.maybe_quote(), e);
                     continue;
                 }
             },

src/uu/groups/src/groups.rs

@@ -17,7 +17,10 @@
 
 #[macro_use]
 extern crate uucore;
-use uucore::entries::{get_groups_gnu, gid2grp, Locate, Passwd};
+use uucore::{
+    display::Quotable,
+    entries::{get_groups_gnu, gid2grp, Locate, Passwd},
+};
 
 use clap::{crate_version, App, Arg};
 
@@ -77,7 +80,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                     .join(" ")
             );
         } else {
-            show_error!("'{}': no such user", user);
+            show_error!("{}: no such user", user.quote());
             exit_code = 1;
         }
     }

src/uu/hashsum/src/hashsum.rs

@@ -34,6 +34,7 @@ use std::io::{self, stdin, BufRead, BufReader, Read};
 use std::iter;
 use std::num::ParseIntError;
 use std::path::Path;
+use uucore::display::Quotable;
 
 const NAME: &str = "hashsum";
 
@@ -525,7 +526,7 @@ where
                             if options.warn {
                                 show_warning!(
                                     "{}: {}: improperly formatted {} checksum line",
-                                    filename.display(),
+                                    filename.maybe_quote(),
                                     i + 1,
                                     options.algoname
                                 );
@@ -546,6 +547,15 @@ where
                     )
                 )
                 .to_ascii_lowercase();
+                // FIXME: Filenames with newlines should be treated specially.
+                // GNU appears to replace newlines by \n and backslashes by
+                // \\ and prepend a backslash (to the hash or filename) if it did
+                // this escaping.
+                // Different sorts of output (checking vs outputting hashes) may
+                // handle this differently. Compare carefully to GNU.
+                // If you can, try to preserve invalid unicode using OsStr(ing)Ext
+                // and display it using uucore::display::print_verbatim(). This is
+                // easier (and more important) on Unix than on Windows.
                 if sum == real_sum {
                     if !options.quiet {
                         println!("{}: OK", ck_filename);

src/uu/head/src/head.rs

@@ -9,6 +9,7 @@ use clap::{crate_version, App, Arg};
 use std::convert::TryFrom;
 use std::ffi::OsString;
 use std::io::{self, ErrorKind, Read, Seek, SeekFrom, Write};
+use uucore::display::Quotable;
 use uucore::{crash, show_error_custom_description};
 
 const EXIT_FAILURE: i32 = 1;
@@ -127,10 +128,10 @@ fn arg_iterate<'a>(
             match parse::parse_obsolete(s) {
                 Some(Ok(iter)) => Ok(Box::new(vec![first].into_iter().chain(iter).chain(args))),
                 Some(Err(e)) => match e {
-                    parse::ParseError::Syntax => Err(format!("bad argument format: '{}'", s)),
+                    parse::ParseError::Syntax => Err(format!("bad argument format: {}", s.quote())),
                     parse::ParseError::Overflow => Err(format!(
-                        "invalid argument: '{}' Value too large for defined datatype",
-                        s
+                        "invalid argument: {} Value too large for defined datatype",
+                        s.quote()
                     )),
                 },
                 None => Ok(Box::new(vec![first, second].into_iter().chain(args))),
@@ -418,7 +419,7 @@ fn uu_head(options: &HeadOptions) -> Result<(), u32> {
                 let mut file = match std::fs::File::open(name) {
                     Ok(f) => f,
                     Err(err) => {
-                        let prefix = format!("cannot open '{}' for reading", name);
+                        let prefix = format!("cannot open {} for reading", name.quote());
                         match err.kind() {
                             ErrorKind::NotFound => {
                                 show_error_custom_description!(prefix, "No such file or directory");

src/uu/id/src/id.rs

@@ -41,6 +41,7 @@ extern crate uucore;
 
 use clap::{crate_version, App, Arg};
 use std::ffi::CStr;
+use uucore::display::Quotable;
 use uucore::entries::{self, Group, Locate, Passwd};
 use uucore::error::UResult;
 use uucore::error::{set_exit_code, USimpleError};
@@ -230,7 +231,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             match Passwd::locate(users[i].as_str()) {
                 Ok(p) => Some(p),
                 Err(_) => {
-                    show_error!("'{}': no such user", users[i]);
+                    show_error!("{}: no such user", users[i].quote());
                     set_exit_code(1);
                     if i + 1 >= users.len() {
                         break;

src/uu/install/src/install.rs

@@ -16,6 +16,7 @@ use clap::{crate_version, App, Arg, ArgMatches};
 use file_diff::diff;
 use filetime::{set_file_times, FileTime};
 use uucore::backup_control::{self, BackupMode};
+use uucore::display::Quotable;
 use uucore::entries::{grp2gid, usr2uid};
 use uucore::error::{FromIo, UError, UIoError, UResult};
 use uucore::mode::get_umask;
@@ -95,40 +96,30 @@ impl Display for InstallError {
                 )
             }
             IE::CreateDirFailed(dir, e) => {
-                Display::fmt(&uio_error!(e, "failed to create {}", dir.display()), f)
+                Display::fmt(&uio_error!(e, "failed to create {}", dir.quote()), f)
             }
-            IE::ChmodFailed(file) => write!(f, "failed to chmod {}", file.display()),
+            IE::ChmodFailed(file) => write!(f, "failed to chmod {}", file.quote()),
             IE::InvalidTarget(target) => write!(
                 f,
                 "invalid target {}: No such file or directory",
-                target.display()
+                target.quote()
             ),
             IE::TargetDirIsntDir(target) => {
-                write!(f, "target '{}' is not a directory", target.display())
+                write!(f, "target {} is not a directory", target.quote())
             }
             IE::BackupFailed(from, to, e) => Display::fmt(
-                &uio_error!(
-                    e,
-                    "cannot backup '{}' to '{}'",
-                    from.display(),
-                    to.display()
-                ),
+                &uio_error!(e, "cannot backup {} to {}", from.quote(), to.quote()),
                 f,
             ),
             IE::InstallFailed(from, to, e) => Display::fmt(
-                &uio_error!(
-                    e,
-                    "cannot install '{}' to '{}'",
-                    from.display(),
-                    to.display()
-                ),
+                &uio_error!(e, "cannot install {} to {}", from.quote(), to.quote()),
                 f,
             ),
             IE::StripProgramFailed(msg) => write!(f, "strip program failed: {}", msg),
             IE::MetadataFailed(e) => Display::fmt(&uio_error!(e, ""), f),
-            IE::NoSuchUser(user) => write!(f, "no such user: {}", user),
-            IE::NoSuchGroup(group) => write!(f, "no such group: {}", group),
-            IE::OmittingDirectory(dir) => write!(f, "omitting directory '{}'", dir.display()),
+            IE::NoSuchUser(user) => write!(f, "no such user: {}", user.maybe_quote()),
+            IE::NoSuchGroup(group) => write!(f, "no such group: {}", group.maybe_quote()),
+            IE::OmittingDirectory(dir) => write!(f, "omitting directory {}", dir.quote()),
         }
     }
 }
@@ -416,14 +407,14 @@ fn directory(paths: Vec<String>, b: Behavior) -> UResult<()> {
                 // the default mode. Hence it is safe to use fs::create_dir_all
                 // and then only modify the target's dir mode.
                 if let Err(e) =
-                    fs::create_dir_all(path).map_err_context(|| format!("{}", path.display()))
+                    fs::create_dir_all(path).map_err_context(|| path.maybe_quote().to_string())
                 {
                     show!(e);
                     continue;
                 }
 
                 if b.verbose {
-                    println!("creating directory '{}'", path.display());
+                    println!("creating directory {}", path.quote());
                 }
             }
 
@@ -445,7 +436,7 @@ fn directory(paths: Vec<String>, b: Behavior) -> UResult<()> {
 fn is_new_file_path(path: &Path) -> bool {
     !path.exists()
         && (path.parent().map(Path::is_dir).unwrap_or(true)
-            || path.parent().unwrap().to_string_lossy().is_empty()) // In case of a simple file
+            || path.parent().unwrap().as_os_str().is_empty()) // In case of a simple file
 }
 
 /// Perform an install, given a list of paths and behavior.
@@ -502,7 +493,7 @@ fn copy_files_into_dir(files: &[PathBuf], target_dir: &Path, b: &Behavior) -> UR
         if !sourcepath.exists() {
             let err = UIoError::new(
                 std::io::ErrorKind::NotFound,
-                format!("cannot stat '{}'", sourcepath.display()),
+                format!("cannot stat {}", sourcepath.quote()),
             );
             show!(err);
             continue;
@@ -566,7 +557,7 @@ fn copy(from: &Path, to: &Path, b: &Behavior) -> UResult<()> {
         }
     }
 
-    if from.to_string_lossy() == "/dev/null" {
+    if from.as_os_str() == "/dev/null" {
         /* workaround a limitation of fs::copy
          * https://github.com/rust-lang/rust/issues/79390
          */
@@ -674,9 +665,9 @@ fn copy(from: &Path, to: &Path, b: &Behavior) -> UResult<()> {
     }
 
     if b.verbose {
-        print!("'{}' -> '{}'", from.display(), to.display());
+        print!("{} -> {}", from.quote(), to.quote());
         match backup_path {
-            Some(path) => println!(" (backup: '{}')", path.display()),
+            Some(path) => println!(" (backup: {})", path.quote()),
             None => println!(),
         }
     }

src/uu/install/src/mode.rs

@@ -22,8 +22,9 @@ pub fn parse(mode_string: &str, considering_dir: bool, umask: u32) -> Result<u32
 #[cfg(any(unix, target_os = "redox"))]
 pub fn chmod(path: &Path, mode: u32) -> Result<(), ()> {
     use std::os::unix::fs::PermissionsExt;
+    use uucore::display::Quotable;
     fs::set_permissions(path, fs::Permissions::from_mode(mode)).map_err(|err| {
-        show_error!("{}: chmod failed with error {}", path.display(), err);
+        show_error!("{}: chmod failed with error {}", path.maybe_quote(), err);
     })
 }
 

src/uu/join/src/join.rs

@@ -14,6 +14,7 @@ use clap::{crate_version, App, Arg};
 use std::cmp::Ordering;
 use std::fs::File;
 use std::io::{stdin, BufRead, BufReader, Lines, Stdin};
+use uucore::display::Quotable;
 
 static NAME: &str = "join";
 
@@ -181,18 +182,18 @@ impl Spec {
                     return Spec::Key;
                 }
 
-                crash!(1, "invalid field specifier: '{}'", format);
+                crash!(1, "invalid field specifier: {}", format.quote());
             }
             Some('1') => FileNum::File1,
             Some('2') => FileNum::File2,
-            _ => crash!(1, "invalid file number in field spec: '{}'", format),
+            _ => crash!(1, "invalid file number in field spec: {}", format.quote()),
         };
 
         if let Some('.') = chars.next() {
             return Spec::Field(file_num, parse_field_number(chars.as_str()));
         }
 
-        crash!(1, "invalid field specifier: '{}'", format);
+        crash!(1, "invalid field specifier: {}", format.quote());
     }
 }
 
@@ -245,7 +246,7 @@ impl<'a> State<'a> {
         } else {
             match File::open(name) {
                 Ok(file) => Box::new(BufReader::new(file)) as Box<dyn BufRead>,
-                Err(err) => crash!(1, "{}: {}", name, err),
+                Err(err) => crash!(1, "{}: {}", name.maybe_quote(), err),
             }
         };
 
@@ -393,7 +394,11 @@ impl<'a> State<'a> {
         let diff = input.compare(self.get_current_key(), line.get_field(self.key));
 
         if diff == Ordering::Greater {
-            eprintln!("{}:{}: is not sorted", self.file_name, self.line_num);
+            eprintln!(
+                "{}:{}: is not sorted",
+                self.file_name.maybe_quote(),
+                self.line_num
+            );
 
             // This is fatal if the check is enabled.
             if input.check_order == CheckOrder::Enabled {
@@ -727,7 +732,7 @@ fn get_field_number(keys: Option<usize>, key: Option<usize>) -> usize {
 fn parse_field_number(value: &str) -> usize {
     match value.parse::<usize>() {
         Ok(result) if result > 0 => result - 1,
-        _ => crash!(1, "invalid field number: '{}'", value),
+        _ => crash!(1, "invalid field number: {}", value.quote()),
     }
 }
 
@@ -735,7 +740,7 @@ fn parse_file_number(value: &str) -> FileNum {
     match value {
         "1" => FileNum::File1,
         "2" => FileNum::File2,
-        value => crash!(1, "invalid file number: '{}'", value),
+        value => crash!(1, "invalid file number: {}", value.quote()),
     }
 }
 

src/uu/kill/src/kill.rs

@@ -13,6 +13,7 @@ extern crate uucore;
 use clap::{crate_version, App, Arg};
 use libc::{c_int, pid_t};
 use std::io::Error;
+use uucore::display::Quotable;
 use uucore::error::{UResult, USimpleError};
 use uucore::signals::ALL_SIGNALS;
 use uucore::InvalidEncodingHandling;
@@ -154,7 +155,7 @@ fn print_signal(signal_name_or_value: &str) -> UResult<()> {
     }
     Err(USimpleError::new(
         1,
-        format!("unknown signal name {}", signal_name_or_value),
+        format!("unknown signal name {}", signal_name_or_value.quote()),
     ))
 }
 
@@ -190,7 +191,7 @@ fn kill(signalname: &str, pids: &[String]) -> UResult<()> {
         None => {
             return Err(USimpleError::new(
                 1,
-                format!("unknown signal name {}", signalname),
+                format!("unknown signal name {}", signalname.quote()),
             ));
         }
     };
@@ -204,7 +205,7 @@ fn kill(signalname: &str, pids: &[String]) -> UResult<()> {
             Err(e) => {
                 return Err(USimpleError::new(
                     1,
-                    format!("failed to parse argument {}: {}", pid, e),
+                    format!("failed to parse argument {}: {}", pid.quote(), e),
                 ));
             }
         };

src/uu/ln/src/ln.rs

@@ -11,11 +11,12 @@
 extern crate uucore;
 
 use clap::{crate_version, App, Arg};
+use uucore::display::Quotable;
 use uucore::error::{UError, UResult};
 
 use std::borrow::Cow;
 use std::error::Error;
-use std::ffi::OsStr;
+use std::ffi::{OsStr, OsString};
 use std::fmt::Display;
 use std::fs;
 
@@ -49,26 +50,26 @@ pub enum OverwriteMode {
 
 #[derive(Debug)]
 enum LnError {
-    TargetIsDirectory(String),
+    TargetIsDirectory(PathBuf),
     SomeLinksFailed,
     FailedToLink(String),
-    MissingDestination(String),
-    ExtraOperand(String),
+    MissingDestination(PathBuf),
+    ExtraOperand(OsString),
 }
 
 impl Display for LnError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::TargetIsDirectory(s) => write!(f, "target '{}' is not a directory", s),
-            Self::FailedToLink(s) => write!(f, "failed to link '{}'", s),
+            Self::TargetIsDirectory(s) => write!(f, "target {} is not a directory", s.quote()),
+            Self::FailedToLink(e) => write!(f, "failed to link: {}", e),
             Self::SomeLinksFailed => write!(f, "some links failed to create"),
             Self::MissingDestination(s) => {
-                write!(f, "missing destination file operand after '{}'", s)
+                write!(f, "missing destination file operand after {}", s.quote())
             }
             Self::ExtraOperand(s) => write!(
                 f,
-                "extra operand '{}'\nTry '{} --help' for more information.",
-                s,
+                "extra operand {}\nTry '{} --help' for more information.",
+                s.quote(),
                 uucore::execution_phrase()
             ),
         }
@@ -279,10 +280,10 @@ fn exec(files: &[PathBuf], settings: &Settings) -> UResult<()> {
     // 1st form. Now there should be only two operands, but if -T is
     // specified we may have a wrong number of operands.
     if files.len() == 1 {
-        return Err(LnError::MissingDestination(files[0].to_string_lossy().into()).into());
+        return Err(LnError::MissingDestination(files[0].clone()).into());
     }
     if files.len() > 2 {
-        return Err(LnError::ExtraOperand(files[2].display().to_string()).into());
+        return Err(LnError::ExtraOperand(files[2].clone().into()).into());
     }
     assert!(!files.is_empty());
 
@@ -294,7 +295,7 @@ fn exec(files: &[PathBuf], settings: &Settings) -> UResult<()> {
 
 fn link_files_in_dir(files: &[PathBuf], target_dir: &Path, settings: &Settings) -> UResult<()> {
     if !target_dir.is_dir() {
-        return Err(LnError::TargetIsDirectory(target_dir.display().to_string()).into());
+        return Err(LnError::TargetIsDirectory(target_dir.to_owned()).into());
     }
 
     let mut all_successful = true;
@@ -306,7 +307,7 @@ fn link_files_in_dir(files: &[PathBuf], target_dir: &Path, settings: &Settings)
                 if is_symlink(target_dir) {
                     if target_dir.is_file() {
                         if let Err(e) = fs::remove_file(target_dir) {
-                            show_error!("Could not update {}: {}", target_dir.display(), e)
+                            show_error!("Could not update {}: {}", target_dir.quote(), e)
                         };
                     }
                     if target_dir.is_dir() {
@@ -314,7 +315,7 @@ fn link_files_in_dir(files: &[PathBuf], target_dir: &Path, settings: &Settings)
                         // considered as a dir
                         // See test_ln::test_symlink_no_deref_dir
                         if let Err(e) = fs::remove_dir(target_dir) {
-                            show_error!("Could not update {}: {}", target_dir.display(), e)
+                            show_error!("Could not update {}: {}", target_dir.quote(), e)
                         };
                     }
                 }
@@ -332,10 +333,7 @@ fn link_files_in_dir(files: &[PathBuf], target_dir: &Path, settings: &Settings)
                         }
                     }
                     None => {
-                        show_error!(
-                            "cannot stat '{}': No such file or directory",
-                            srcpath.display()
-                        );
+                        show_error!("cannot stat {}: No such file or directory", srcpath.quote());
                         all_successful = false;
                         continue;
                     }
@@ -344,9 +342,9 @@ fn link_files_in_dir(files: &[PathBuf], target_dir: &Path, settings: &Settings)
 
         if let Err(e) = link(srcpath, &targetpath, settings) {
             show_error!(
-                "cannot link '{}' to '{}': {}",
-                targetpath.display(),
-                srcpath.display(),
+                "cannot link {} to {}: {}",
+                targetpath.quote(),
+                srcpath.quote(),
                 e
             );
             all_successful = false;
@@ -399,7 +397,7 @@ fn link(src: &Path, dst: &Path, settings: &Settings) -> Result<()> {
         match settings.overwrite {
             OverwriteMode::NoClobber => {}
             OverwriteMode::Interactive => {
-                print!("{}: overwrite '{}'? ", uucore::util_name(), dst.display());
+                print!("{}: overwrite {}? ", uucore::util_name(), dst.quote());
                 if !read_yes() {
                     return Ok(());
                 }
@@ -426,9 +424,9 @@ fn link(src: &Path, dst: &Path, settings: &Settings) -> Result<()> {
     }
 
     if settings.verbose {
-        print!("'{}' -> '{}'", dst.display(), &source.display());
+        print!("{} -> {}", dst.quote(), source.quote());
         match backup_path {
-            Some(path) => println!(" (backup: '{}')", path.display()),
+            Some(path) => println!(" (backup: {})", path.quote()),
             None => println!(),
         }
     }

src/uu/logname/src/logname.rs

@@ -35,7 +35,7 @@ fn get_userlogin() -> Option<String> {
 
 static SUMMARY: &str = "Print user's login name";
 
-fn usage() -> String {
+fn usage() -> &'static str {
     uucore::execution_phrase()
 }
 
@@ -44,8 +44,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         .collect_str(InvalidEncodingHandling::Ignore)
         .accept_any();
 
-    let usage = usage();
-    let _ = uu_app().usage(&usage[..]).get_matches_from(args);
+    let _ = uu_app().usage(usage()).get_matches_from(args);
 
     match get_userlogin() {
         Some(userlogin) => println!("{}", userlogin),

src/uu/ls/src/ls.rs

@@ -40,8 +40,10 @@ use std::{
     time::Duration,
 };
 use term_grid::{Cell, Direction, Filling, Grid, GridOptions};
-use uucore::display::Quotable;
-use uucore::error::{set_exit_code, FromIo, UError, UResult};
+use uucore::{
+    display::Quotable,
+    error::{set_exit_code, FromIo, UError, UResult},
+};
 
 use unicode_width::UnicodeWidthStr;
 #[cfg(unix)]
@@ -157,8 +159,8 @@ impl Error for LsError {}
 impl Display for LsError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            LsError::InvalidLineWidth(s) => write!(f, "invalid line width: '{}'", s),
-            LsError::NoMetadata(p) => write!(f, "could not open file: '{}'", p.display()),
+            LsError::InvalidLineWidth(s) => write!(f, "invalid line width: {}", s.quote()),
+            LsError::NoMetadata(p) => write!(f, "could not open file: {}", p.quote()),
         }
     }
 }
@@ -428,18 +430,18 @@ impl Config {
             },
             None => match termsize::get() {
                 Some(size) => size.cols,
-                None => match std::env::var("COLUMNS") {
-                    Ok(columns) => match columns.parse() {
-                        Ok(columns) => columns,
-                        Err(_) => {
+                None => match std::env::var_os("COLUMNS") {
+                    Some(columns) => match columns.to_str().and_then(|s| s.parse().ok()) {
+                        Some(columns) => columns,
+                        None => {
                             show_error!(
-                                "ignoring invalid width in environment variable COLUMNS: '{}'",
-                                columns
+                                "ignoring invalid width in environment variable COLUMNS: {}",
+                                columns.quote()
                             );
                             DEFAULT_TERM_WIDTH
                         }
                     },
-                    Err(_) => DEFAULT_TERM_WIDTH,
+                    None => DEFAULT_TERM_WIDTH,
                 },
             },
         };
@@ -556,7 +558,7 @@ impl Config {
                 Ok(p) => {
                     ignore_patterns.add(p);
                 }
-                Err(_) => show_warning!("Invalid pattern for ignore: '{}'", pattern),
+                Err(_) => show_warning!("Invalid pattern for ignore: {}", pattern.quote()),
             }
         }
 
@@ -566,7 +568,7 @@ impl Config {
                     Ok(p) => {
                         ignore_patterns.add(p);
                     }
-                    Err(_) => show_warning!("Invalid pattern for hide: '{}'", pattern),
+                    Err(_) => show_warning!("Invalid pattern for hide: {}", pattern.quote()),
                 }
             }
         }
@@ -1332,7 +1334,7 @@ fn list(locs: Vec<&Path>, config: Config) -> UResult<()> {
 
         if path_data.md().is_none() {
             show!(std::io::ErrorKind::NotFound
-                .map_err_context(|| format!("cannot access '{}'", path_data.p_buf.display())));
+                .map_err_context(|| format!("cannot access {}", path_data.p_buf.quote())));
             // We found an error, no need to continue the execution
             continue;
         }

src/uu/mkdir/src/mkdir.rs

@@ -12,6 +12,7 @@ use clap::OsValues;
 use clap::{crate_version, App, Arg};
 use std::fs;
 use std::path::Path;
+use uucore::display::Quotable;
 use uucore::error::{FromIo, UResult, USimpleError};
 
 static ABOUT: &str = "Create the given DIRECTORY(ies) if they do not exist";
@@ -43,7 +44,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     // Not tested on Windows
     let mode: u16 = match matches.value_of(options::MODE) {
         Some(m) => u16::from_str_radix(m, 8)
-            .map_err(|_| USimpleError::new(1, format!("invalid mode '{}'", m)))?,
+            .map_err(|_| USimpleError::new(1, format!("invalid mode {}", m.quote())))?,
         None => 0o755_u16,
     };
 
@@ -100,13 +101,13 @@ fn mkdir(path: &Path, recursive: bool, mode: u16, verbose: bool) -> UResult<()>
         fs::create_dir
     };
 
-    create_dir(path).map_err_context(|| format!("cannot create directory '{}'", path.display()))?;
+    create_dir(path).map_err_context(|| format!("cannot create directory {}", path.quote()))?;
 
     if verbose {
         println!(
-            "{}: created directory '{}'",
+            "{}: created directory {}",
             uucore::util_name(),
-            path.display()
+            path.quote()
         );
     }
 
@@ -121,7 +122,7 @@ fn chmod(path: &Path, mode: u16) -> UResult<()> {
     let mode = Permissions::from_mode(u32::from(mode));
 
     set_permissions(path, mode)
-        .map_err_context(|| format!("cannot set permissions '{}'", path.display()))
+        .map_err_context(|| format!("cannot set permissions {}", path.quote()))
 }
 
 #[cfg(windows)]

src/uu/mkfifo/src/mkfifo.rs

@@ -11,7 +11,7 @@ extern crate uucore;
 use clap::{crate_version, App, Arg};
 use libc::mkfifo;
 use std::ffi::CString;
-use uucore::InvalidEncodingHandling;
+use uucore::{display::Quotable, InvalidEncodingHandling};
 
 static NAME: &str = "mkfifo";
 static USAGE: &str = "mkfifo [OPTION]... NAME...";
@@ -61,7 +61,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
             mkfifo(name.as_ptr(), mode as libc::mode_t)
         };
         if err == -1 {
-            show_error!("cannot create fifo '{}': File exists", f);
+            show_error!("cannot create fifo {}: File exists", f.quote());
             exit_code = 1;
         }
     }

src/uu/mknod/src/mknod.rs

@@ -16,6 +16,7 @@ use clap::{crate_version, App, Arg, ArgMatches};
 use libc::{dev_t, mode_t};
 use libc::{S_IFBLK, S_IFCHR, S_IFIFO, S_IRGRP, S_IROTH, S_IRUSR, S_IWGRP, S_IWOTH, S_IWUSR};
 
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 static ABOUT: &str = "Create the special file NAME of the given TYPE.";
@@ -219,7 +220,7 @@ fn valid_type(tpe: String) -> Result<(), String> {
             if vec!['b', 'c', 'u', 'p'].contains(&first_char) {
                 Ok(())
             } else {
-                Err(format!("invalid device type '{}'", tpe))
+                Err(format!("invalid device type {}", tpe.quote()))
             }
         })
 }

src/uu/mktemp/src/mktemp.rs

@@ -12,6 +12,7 @@
 extern crate uucore;
 
 use clap::{crate_version, App, Arg};
+use uucore::display::{println_verbatim, Quotable};
 use uucore::error::{FromIo, UError, UResult};
 
 use std::env;
@@ -57,16 +58,20 @@ impl Display for MkTempError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         use MkTempError::*;
         match self {
-            PersistError(p) => write!(f, "could not persist file '{}'", p.display()),
-            MustEndInX(s) => write!(f, "with --suffix, template '{}' must end in X", s),
-            TooFewXs(s) => write!(f, "too few X's in template '{}'", s),
+            PersistError(p) => write!(f, "could not persist file {}", p.quote()),
+            MustEndInX(s) => write!(f, "with --suffix, template {} must end in X", s.quote()),
+            TooFewXs(s) => write!(f, "too few X's in template {}", s.quote()),
             ContainsDirSeparator(s) => {
-                write!(f, "invalid suffix '{}', contains directory separator", s)
+                write!(
+                    f,
+                    "invalid suffix {}, contains directory separator",
+                    s.quote()
+                )
             }
             InvalidTemplate(s) => write!(
                 f,
-                "invalid template, '{}'; with --tmpdir, it may not be absolute",
-                s
+                "invalid template, {}; with --tmpdir, it may not be absolute",
+                s.quote()
             ),
         }
     }
@@ -224,28 +229,26 @@ fn parse_template<'a>(
 
 pub fn dry_exec(mut tmpdir: PathBuf, prefix: &str, rand: usize, suffix: &str) -> UResult<()> {
     let len = prefix.len() + suffix.len() + rand;
-    let mut buf = String::with_capacity(len);
-    buf.push_str(prefix);
-    buf.extend(iter::repeat('X').take(rand));
-    buf.push_str(suffix);
+    let mut buf = Vec::with_capacity(len);
+    buf.extend(prefix.as_bytes());
+    buf.extend(iter::repeat(b'X').take(rand));
+    buf.extend(suffix.as_bytes());
 
     // Randomize.
-    unsafe {
-        // We guarantee utf8.
-        let bytes = &mut buf.as_mut_vec()[prefix.len()..prefix.len() + rand];
-        rand::thread_rng().fill(bytes);
-        for byte in bytes.iter_mut() {
-            *byte = match *byte % 62 {
-                v @ 0..=9 => (v + b'0'),
-                v @ 10..=35 => (v - 10 + b'a'),
-                v @ 36..=61 => (v - 36 + b'A'),
-                _ => unreachable!(),
-            }
+    let bytes = &mut buf[prefix.len()..prefix.len() + rand];
+    rand::thread_rng().fill(bytes);
+    for byte in bytes.iter_mut() {
+        *byte = match *byte % 62 {
+            v @ 0..=9 => (v + b'0'),
+            v @ 10..=35 => (v - 10 + b'a'),
+            v @ 36..=61 => (v - 36 + b'A'),
+            _ => unreachable!(),
         }
     }
+    // We guarantee utf8.
+    let buf = String::from_utf8(buf).unwrap();
     tmpdir.push(buf);
-    println!("{}", tmpdir.display());
-    Ok(())
+    println_verbatim(tmpdir).map_err_context(|| "failed to print directory name".to_owned())
 }
 
 fn exec(dir: PathBuf, prefix: &str, rand: usize, suffix: &str, make_dir: bool) -> UResult<()> {
@@ -274,6 +277,5 @@ fn exec(dir: PathBuf, prefix: &str, rand: usize, suffix: &str, make_dir: bool) -
             .map_err(|e| MkTempError::PersistError(e.file.path().to_path_buf()))?
             .1
     };
-    println!("{}", path.display());
-    Ok(())
+    println_verbatim(path).map_err_context(|| "failed to print directory name".to_owned())
 }

src/uu/more/src/more.rs

@@ -30,6 +30,7 @@ use crossterm::{
 
 use unicode_segmentation::UnicodeSegmentation;
 use unicode_width::UnicodeWidthStr;
+use uucore::display::Quotable;
 
 const BELL: &str = "\x07";
 
@@ -64,12 +65,12 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
             let file = Path::new(file);
             if file.is_dir() {
                 terminal::disable_raw_mode().unwrap();
-                show_usage_error!("'{}' is a directory.", file.display());
+                show_usage_error!("{} is a directory.", file.quote());
                 return 1;
             }
             if !file.exists() {
                 terminal::disable_raw_mode().unwrap();
-                show_error!("cannot open {}: No such file or directory", file.display());
+                show_error!("cannot open {}: No such file or directory", file.quote());
                 return 1;
             }
             if length > 1 {

src/uu/mv/src/mv.rs

@@ -21,6 +21,7 @@ use std::os::unix;
 use std::os::windows;
 use std::path::{Path, PathBuf};
 use uucore::backup_control::{self, BackupMode};
+use uucore::display::Quotable;
 
 use fs_extra::dir::{move_dir, CopyOptions as DirCopyOptions};
 
@@ -223,10 +224,7 @@ fn exec(files: &[PathBuf], b: Behavior) -> i32 {
             // `Ok()` results unless the source does not exist, or the user
             // lacks permission to access metadata.
             if source.symlink_metadata().is_err() {
-                show_error!(
-                    "cannot stat '{}': No such file or directory",
-                    source.display()
-                );
+                show_error!("cannot stat {}: No such file or directory", source.quote());
                 return 1;
             }
 
@@ -234,8 +232,8 @@ fn exec(files: &[PathBuf], b: Behavior) -> i32 {
                 if b.no_target_dir {
                     if !source.is_dir() {
                         show_error!(
-                            "cannot overwrite directory '{}' with non-directory",
-                            target.display()
+                            "cannot overwrite directory {} with non-directory",
+                            target.quote()
                         );
                         return 1;
                     }
@@ -243,9 +241,9 @@ fn exec(files: &[PathBuf], b: Behavior) -> i32 {
                     return match rename(source, target, &b) {
                         Err(e) => {
                             show_error!(
-                                "cannot move '{}' to '{}': {}",
-                                source.display(),
-                                target.display(),
+                                "cannot move {} to {}: {}",
+                                source.quote(),
+                                target.quote(),
                                 e.to_string()
                             );
                             1
@@ -257,9 +255,9 @@ fn exec(files: &[PathBuf], b: Behavior) -> i32 {
                 return move_files_into_dir(&[source.clone()], target, &b);
             } else if target.exists() && source.is_dir() {
                 show_error!(
-                    "cannot overwrite non-directory '{}' with directory '{}'",
-                    target.display(),
-                    source.display()
+                    "cannot overwrite non-directory {} with directory {}",
+                    target.quote(),
+                    source.quote()
                 );
                 return 1;
             }
@@ -272,9 +270,9 @@ fn exec(files: &[PathBuf], b: Behavior) -> i32 {
         _ => {
             if b.no_target_dir {
                 show_error!(
-                    "mv: extra operand '{}'\n\
+                    "mv: extra operand {}\n\
                      Try '{} --help' for more information.",
-                    files[2].display(),
+                    files[2].quote(),
                     uucore::execution_phrase()
                 );
                 return 1;
@@ -288,7 +286,7 @@ fn exec(files: &[PathBuf], b: Behavior) -> i32 {
 
 fn move_files_into_dir(files: &[PathBuf], target_dir: &Path, b: &Behavior) -> i32 {
     if !target_dir.is_dir() {
-        show_error!("target '{}' is not a directory", target_dir.display());
+        show_error!("target {} is not a directory", target_dir.quote());
         return 1;
     }
 
@@ -298,8 +296,8 @@ fn move_files_into_dir(files: &[PathBuf], target_dir: &Path, b: &Behavior) -> i3
             Some(name) => target_dir.join(name),
             None => {
                 show_error!(
-                    "cannot stat '{}': No such file or directory",
-                    sourcepath.display()
+                    "cannot stat {}: No such file or directory",
+                    sourcepath.quote()
                 );
 
                 all_successful = false;
@@ -309,9 +307,9 @@ fn move_files_into_dir(files: &[PathBuf], target_dir: &Path, b: &Behavior) -> i3
 
         if let Err(e) = rename(sourcepath, &targetpath, b) {
             show_error!(
-                "cannot move '{}' to '{}': {}",
-                sourcepath.display(),
-                targetpath.display(),
+                "cannot move {} to {}: {}",
+                sourcepath.quote(),
+                targetpath.quote(),
                 e.to_string()
             );
             all_successful = false;
@@ -332,7 +330,7 @@ fn rename(from: &Path, to: &Path, b: &Behavior) -> io::Result<()> {
         match b.overwrite {
             OverwriteMode::NoClobber => return Ok(()),
             OverwriteMode::Interactive => {
-                println!("{}: overwrite '{}'? ", uucore::util_name(), to.display());
+                println!("{}: overwrite {}? ", uucore::util_name(), to.quote());
                 if !read_yes() {
                     return Ok(());
                 }
@@ -365,9 +363,9 @@ fn rename(from: &Path, to: &Path, b: &Behavior) -> io::Result<()> {
     rename_with_fallback(from, to)?;
 
     if b.verbose {
-        print!("'{}' -> '{}'", from.display(), to.display());
+        print!("{} -> {}", from.quote(), to.quote());
         match backup_path {
-            Some(path) => println!(" (backup: '{}')", path.display()),
+            Some(path) => println!(" (backup: {})", path.quote()),
             None => println!(),
         }
     }

src/uu/nohup/src/nohup.rs

@@ -19,6 +19,7 @@ use std::fs::{File, OpenOptions};
 use std::io::Error;
 use std::os::unix::prelude::*;
 use std::path::{Path, PathBuf};
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 static ABOUT: &str = "Run COMMAND ignoring hangup signals.";
@@ -122,13 +123,16 @@ fn find_stdout() -> File {
         .open(Path::new(NOHUP_OUT))
     {
         Ok(t) => {
-            show_error!("ignoring input and appending output to '{}'", NOHUP_OUT);
+            show_error!(
+                "ignoring input and appending output to {}",
+                NOHUP_OUT.quote()
+            );
             t
         }
         Err(e1) => {
             let home = match env::var("HOME") {
                 Err(_) => {
-                    show_error!("failed to open '{}': {}", NOHUP_OUT, e1);
+                    show_error!("failed to open {}: {}", NOHUP_OUT.quote(), e1);
                     exit!(internal_failure_code)
                 }
                 Ok(h) => h,
@@ -143,12 +147,15 @@ fn find_stdout() -> File {
                 .open(&homeout)
             {
                 Ok(t) => {
-                    show_error!("ignoring input and appending output to '{}'", homeout_str);
+                    show_error!(
+                        "ignoring input and appending output to {}",
+                        homeout_str.quote()
+                    );
                     t
                 }
                 Err(e2) => {
-                    show_error!("failed to open '{}': {}", NOHUP_OUT, e1);
-                    show_error!("failed to open '{}': {}", homeout_str, e2);
+                    show_error!("failed to open {}: {}", NOHUP_OUT.quote(), e1);
+                    show_error!("failed to open {}: {}", homeout_str.quote(), e2);
                     exit!(internal_failure_code)
                 }
             }

src/uu/numfmt/src/format.rs

@@ -1,3 +1,5 @@
+use uucore::display::Quotable;
+
 use crate::options::{NumfmtOptions, RoundMethod};
 use crate::units::{DisplayableSuffix, RawSuffix, Result, Suffix, Unit, IEC_BASES, SI_BASES};
 
@@ -78,7 +80,7 @@ fn parse_suffix(s: &str) -> Result<(f64, Option<Suffix>)> {
         Some('Z') => Some((RawSuffix::Z, with_i)),
         Some('Y') => Some((RawSuffix::Y, with_i)),
         Some('0'..='9') => None,
-        _ => return Err(format!("invalid suffix in input: '{}'", s)),
+        _ => return Err(format!("invalid suffix in input: {}", s.quote())),
     };
 
     let suffix_len = match suffix {
@@ -89,7 +91,7 @@ fn parse_suffix(s: &str) -> Result<(f64, Option<Suffix>)> {
 
     let number = s[..s.len() - suffix_len]
         .parse::<f64>()
-        .map_err(|_| format!("invalid number: '{}'", s))?;
+        .map_err(|_| format!("invalid number: {}", s.quote()))?;
 
     Ok((number, suffix))
 }

src/uu/numfmt/src/numfmt.rs

@@ -15,6 +15,7 @@ use crate::options::*;
 use crate::units::{Result, Unit};
 use clap::{crate_version, App, AppSettings, Arg, ArgMatches};
 use std::io::{BufRead, Write};
+use uucore::display::Quotable;
 use uucore::ranges::Range;
 
 pub mod format;
@@ -113,7 +114,7 @@ fn parse_options(args: &ArgMatches) -> Result<NumfmtOptions> {
                     0 => Err(value),
                     _ => Ok(n),
                 })
-                .map_err(|value| format!("invalid header value '{}'", value))
+                .map_err(|value| format!("invalid header value {}", value.quote()))
         }
     }?;
 

src/uu/od/src/multifilereader.rs

@@ -5,6 +5,8 @@ use std::io;
 use std::io::BufReader;
 use std::vec::Vec;
 
+use uucore::display::Quotable;
+
 pub enum InputSource<'a> {
     FileName(&'a str),
     Stdin,
@@ -57,7 +59,7 @@ impl<'b> MultifileReader<'b> {
                             // print an error at the time that the file is needed,
                             // then move on the the next file.
                             // This matches the behavior of the original `od`
-                            eprintln!("{}: '{}': {}", uucore::util_name(), fname, e);
+                            show_error!("{}: {}", fname.maybe_quote(), e);
                             self.any_err = true
                         }
                     }
@@ -90,7 +92,7 @@ impl<'b> io::Read for MultifileReader<'b> {
                             Ok(0) => break,
                             Ok(n) => n,
                             Err(e) => {
-                                eprintln!("{}: I/O: {}", uucore::util_name(), e);
+                                show_error!("I/O: {}", e);
                                 self.any_err = true;
                                 break;
                             }

src/uu/od/src/od.rs

@@ -43,6 +43,7 @@ use crate::partialreader::*;
 use crate::peekreader::*;
 use crate::prn_char::format_ascii_dump;
 use clap::{self, crate_version, AppSettings, Arg, ArgMatches};
+use uucore::display::Quotable;
 use uucore::parse_size::ParseSizeError;
 use uucore::InvalidEncodingHandling;
 
@@ -635,7 +636,7 @@ fn format_error_message(error: ParseSizeError, s: &str, option: &str) -> String
     // GNU's od echos affected flag, -N or --read-bytes (-j or --skip-bytes, etc.), depending user's selection
     // GNU's od does distinguish between "invalid (suffix in) argument"
     match error {
-        ParseSizeError::ParseFailure(_) => format!("invalid --{} argument '{}'", option, s),
-        ParseSizeError::SizeTooBig(_) => format!("--{} argument '{}' too large", option, s),
+        ParseSizeError::ParseFailure(_) => format!("invalid --{} argument {}", option, s.quote()),
+        ParseSizeError::SizeTooBig(_) => format!("--{} argument {} too large", option, s.quote()),
     }
 }

src/uu/od/src/parse_formats.rs

@@ -1,5 +1,7 @@
 // spell-checker:ignore formatteriteminfo docopt fvox fvoxw vals acdx
 
+use uucore::display::Quotable;
+
 use crate::formatteriteminfo::FormatterItemInfo;
 use crate::prn_char::*;
 use crate::prn_float::*;
@@ -272,8 +274,9 @@ fn parse_type_string(params: &str) -> Result<Vec<ParsedFormatterItemInfo>, Strin
     while let Some(type_char) = ch {
         let type_char = format_type(type_char).ok_or_else(|| {
             format!(
-                "unexpected char '{}' in format specification '{}'",
-                type_char, params
+                "unexpected char '{}' in format specification {}",
+                type_char,
+                params.quote()
             )
         })?;
 
@@ -293,8 +296,9 @@ fn parse_type_string(params: &str) -> Result<Vec<ParsedFormatterItemInfo>, Strin
             if !decimal_size.is_empty() {
                 byte_size = decimal_size.parse().map_err(|_| {
                     format!(
-                        "invalid number '{}' in format specification '{}'",
-                        decimal_size, params
+                        "invalid number {} in format specification {}",
+                        decimal_size.quote(),
+                        params.quote()
                     )
                 })?;
             }
@@ -305,8 +309,9 @@ fn parse_type_string(params: &str) -> Result<Vec<ParsedFormatterItemInfo>, Strin
 
         let ft = od_format_type(type_char, byte_size).ok_or_else(|| {
             format!(
-                "invalid size '{}' in format specification '{}'",
-                byte_size, params
+                "invalid size '{}' in format specification {}",
+                byte_size,
+                params.quote()
             )
         })?;
         formats.push(ParsedFormatterItemInfo::new(ft, show_ascii_dump));

src/uu/pathchk/src/pathchk.rs

@@ -15,6 +15,7 @@ extern crate uucore;
 use clap::{crate_version, App, Arg};
 use std::fs;
 use std::io::{ErrorKind, Write};
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 // operating mode
@@ -153,10 +154,10 @@ fn check_basic(path: &[String]) -> bool {
         if component_len > POSIX_NAME_MAX {
             writeln!(
                 &mut std::io::stderr(),
-                "limit {} exceeded by length {} of file name component '{}'",
+                "limit {} exceeded by length {} of file name component {}",
                 POSIX_NAME_MAX,
                 component_len,
-                p
+                p.quote()
             );
             return false;
         }
@@ -175,8 +176,8 @@ fn check_extra(path: &[String]) -> bool {
         if p.starts_with('-') {
             writeln!(
                 &mut std::io::stderr(),
-                "leading hyphen in file name component '{}'",
-                p
+                "leading hyphen in file name component {}",
+                p.quote()
             );
             return false;
         }
@@ -197,10 +198,10 @@ fn check_default(path: &[String]) -> bool {
     if total_len > libc::PATH_MAX as usize {
         writeln!(
             &mut std::io::stderr(),
-            "limit {} exceeded by length {} of file name '{}'",
+            "limit {} exceeded by length {} of file name {}",
             libc::PATH_MAX,
             total_len,
-            joined_path
+            joined_path.quote()
         );
         return false;
     }
@@ -210,10 +211,10 @@ fn check_default(path: &[String]) -> bool {
         if component_len > libc::FILENAME_MAX as usize {
             writeln!(
                 &mut std::io::stderr(),
-                "limit {} exceeded by length {} of file name component '{}'",
+                "limit {} exceeded by length {} of file name component {}",
                 libc::FILENAME_MAX,
                 component_len,
-                p
+                p.quote()
             );
             return false;
         }
@@ -246,9 +247,9 @@ fn check_portable_chars(path_segment: &str) -> bool {
             let invalid = path_segment[i..].chars().next().unwrap();
             writeln!(
                 &mut std::io::stderr(),
-                "nonportable character '{}' in file name component '{}'",
+                "nonportable character '{}' in file name component {}",
                 invalid,
-                path_segment
+                path_segment.quote()
             );
             return false;
         }

src/uu/pr/src/pr.rs

@@ -24,6 +24,8 @@ use std::io::{stdin, stdout, BufRead, BufReader, Lines, Read, Stdout, Write};
 #[cfg(unix)]
 use std::os::unix::fs::FileTypeExt;
 
+use uucore::display::Quotable;
+
 type IOError = std::io::Error;
 
 const NAME: &str = "pr";
@@ -517,7 +519,7 @@ fn parse_usize(matches: &Matches, opt: &str) -> Option<Result<usize, PrError>> {
         let i = value_to_parse.0;
         let option = value_to_parse.1;
         i.parse().map_err(|_e| {
-            PrError::EncounteredErrors(format!("invalid {} argument '{}'", option, i))
+            PrError::EncounteredErrors(format!("invalid {} argument {}", option, i.quote()))
         })
     };
     matches
@@ -619,7 +621,7 @@ fn build_options(
         let unparsed_num = i.get(1).unwrap().as_str().trim();
         let x: Vec<_> = unparsed_num.split(':').collect();
         x[0].to_string().parse::<usize>().map_err(|_e| {
-            PrError::EncounteredErrors(format!("invalid {} argument '{}'", "+", unparsed_num))
+            PrError::EncounteredErrors(format!("invalid {} argument {}", "+", unparsed_num.quote()))
         })
     }) {
         Some(res) => res?,
@@ -633,7 +635,11 @@ fn build_options(
         .map(|unparsed_num| {
             let x: Vec<_> = unparsed_num.split(':').collect();
             x[1].to_string().parse::<usize>().map_err(|_e| {
-                PrError::EncounteredErrors(format!("invalid {} argument '{}'", "+", unparsed_num))
+                PrError::EncounteredErrors(format!(
+                    "invalid {} argument {}",
+                    "+",
+                    unparsed_num.quote()
+                ))
             })
         }) {
         Some(res) => Some(res?),
@@ -643,7 +649,10 @@ fn build_options(
     let invalid_pages_map = |i: String| {
         let unparsed_value = matches.opt_str(options::PAGE_RANGE_OPTION).unwrap();
         i.parse::<usize>().map_err(|_e| {
-            PrError::EncounteredErrors(format!("invalid --pages argument '{}'", unparsed_value))
+            PrError::EncounteredErrors(format!(
+                "invalid --pages argument {}",
+                unparsed_value.quote()
+            ))
         })
     };
 
@@ -741,7 +750,7 @@ fn build_options(
     let start_column_option = match re_col.captures(&free_args).map(|i| {
         let unparsed_num = i.get(1).unwrap().as_str().trim();
         unparsed_num.parse::<usize>().map_err(|_e| {
-            PrError::EncounteredErrors(format!("invalid {} argument '{}'", "-", unparsed_num))
+            PrError::EncounteredErrors(format!("invalid {} argument {}", "-", unparsed_num.quote()))
         })
     }) {
         Some(res) => Some(res?),

src/uu/printf/src/cli.rs

@@ -2,20 +2,11 @@
 
 // spell-checker:ignore (ToDO) bslice
 
-use std::env;
-use std::io::{stderr, stdout, Write};
+use std::io::{stdout, Write};
 
 pub const EXIT_OK: i32 = 0;
 pub const EXIT_ERR: i32 = 1;
 
-pub fn err_msg(msg: &str) {
-    let exe_path = match env::current_exe() {
-        Ok(p) => p.to_string_lossy().into_owned(),
-        _ => String::from(""),
-    };
-    writeln!(&mut stderr(), "{}: {}", exe_path, msg).unwrap();
-}
-
 // by default stdout only flushes
 // to console when a newline is passed.
 pub fn flush_char(c: char) {

src/uu/printf/src/memo.rs

@@ -8,8 +8,9 @@
 use itertools::put_back_n;
 use std::iter::Peekable;
 use std::slice::Iter;
+use uucore::display::Quotable;
+use uucore::show_warning;
 
-use crate::cli;
 use crate::tokenize::sub::Sub;
 use crate::tokenize::token::{Token, Tokenizer};
 use crate::tokenize::unescaped_text::UnescapedText;
@@ -19,10 +20,10 @@ pub struct Memo {
 }
 
 fn warn_excess_args(first_arg: &str) {
-    cli::err_msg(&format!(
-        "warning: ignoring excess arguments, starting with '{}'",
-        first_arg
-    ));
+    show_warning!(
+        "ignoring excess arguments, starting with {}",
+        first_arg.quote()
+    );
 }
 
 impl Memo {

src/uu/printf/src/tokenize/num_format/formatter.rs

@@ -3,15 +3,15 @@
 
 use itertools::{put_back_n, PutBackN};
 use std::str::Chars;
+use uucore::{display::Quotable, show_error};
 
 use super::format_field::FormatField;
 
-use crate::cli;
-
 // contains the rough ingredients to final
 // output for a number, organized together
 // to allow for easy generalization of output manipulation
 // (e.g. max number of digits after decimal)
+#[derive(Default)]
 pub struct FormatPrimitive {
     pub prefix: Option<String>,
     pub pre_decimal: Option<String>,
@@ -19,17 +19,6 @@ pub struct FormatPrimitive {
     pub suffix: Option<String>,
 }
 
-impl Default for FormatPrimitive {
-    fn default() -> FormatPrimitive {
-        FormatPrimitive {
-            prefix: None,
-            pre_decimal: None,
-            post_decimal: None,
-            suffix: None,
-        }
-    }
-}
-
 #[derive(Clone, PartialEq)]
 pub enum Base {
     Ten = 10,
@@ -66,5 +55,5 @@ pub fn get_it_at(offset: usize, str_in: &str) -> PutBackN<Chars> {
 // TODO: put this somewhere better
 pub fn warn_incomplete_conv(pf_arg: &str) {
     // important: keep println here not print
-    cli::err_msg(&format!("{}: value not completely converted", pf_arg))
+    show_error!("{}: value not completely converted", pf_arg.maybe_quote());
 }

src/uu/printf/src/tokenize/num_format/num_format.rs

@@ -7,6 +7,9 @@
 use std::env;
 use std::vec::Vec;
 
+use uucore::display::Quotable;
+use uucore::{show_error, show_warning};
+
 use super::format_field::{FieldType, FormatField};
 use super::formatter::{Base, FormatPrimitive, Formatter, InitialPrefix};
 use super::formatters::cninetyninehexfloatf::CninetyNineHexFloatf;
@@ -15,11 +18,9 @@ use super::formatters::floatf::Floatf;
 use super::formatters::intf::Intf;
 use super::formatters::scif::Scif;
 
-use crate::cli;
-
 pub fn warn_expected_numeric(pf_arg: &str) {
     // important: keep println here not print
-    cli::err_msg(&format!("{}: expected a numeric value", pf_arg));
+    show_error!("{}: expected a numeric value", pf_arg.maybe_quote());
 }
 
 // when character constant arguments have excess characters
@@ -29,11 +30,11 @@ fn warn_char_constant_ign(remaining_bytes: Vec<u8>) {
         Ok(_) => {}
         Err(e) => {
             if let env::VarError::NotPresent = e {
-                cli::err_msg(&format!(
-                    "warning: {:?}: character(s) following character \
+                show_warning!(
+                    "{:?}: character(s) following character \
                      constant have been ignored",
                     &*remaining_bytes
-                ));
+                );
             }
         }
     }

src/uu/printf/src/tokenize/sub.rs

@@ -10,6 +10,7 @@ use std::iter::Peekable;
 use std::process::exit;
 use std::slice::Iter;
 use std::str::Chars;
+use uucore::show_error;
 // use std::collections::HashSet;
 
 use super::num_format::format_field::{FieldType, FormatField};
@@ -19,7 +20,7 @@ use super::unescaped_text::UnescapedText;
 use crate::cli;
 
 fn err_conv(sofar: &str) {
-    cli::err_msg(&format!("%{}: invalid conversion specification", sofar));
+    show_error!("%{}: invalid conversion specification", sofar);
     exit(cli::EXIT_ERR);
 }
 

src/uu/ptx/src/ptx.rs

@@ -17,6 +17,7 @@ use std::collections::{BTreeSet, HashMap, HashSet};
 use std::default::Default;
 use std::fs::File;
 use std::io::{stdin, stdout, BufRead, BufReader, BufWriter, Read, Write};
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 static NAME: &str = "ptx";
@@ -292,7 +293,11 @@ fn create_word_set(config: &Config, filter: &WordFilter, file_map: &FileMap) ->
 
 fn get_reference(config: &Config, word_ref: &WordRef, line: &str, context_reg: &Regex) -> String {
     if config.auto_ref {
-        format!("{}:{}", word_ref.filename, word_ref.local_line_nr + 1)
+        format!(
+            "{}:{}",
+            word_ref.filename.maybe_quote(),
+            word_ref.local_line_nr + 1
+        )
     } else if config.input_ref {
         let (beg, end) = match context_reg.find(line) {
             Some(x) => (x.start(), x.end()),

src/uu/readlink/src/readlink.rs

@@ -14,6 +14,7 @@ use clap::{crate_version, App, Arg};
 use std::fs;
 use std::io::{stdout, Write};
 use std::path::{Path, PathBuf};
+use uucore::display::Quotable;
 use uucore::fs::{canonicalize, MissingHandling, ResolveMode};
 
 const ABOUT: &str = "Print value of a symbolic link or canonical file name.";
@@ -71,10 +72,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     }
 
     if no_newline && files.len() > 1 && !silent {
-        eprintln!(
-            "{}: ignoring --no-newline with multiple arguments",
-            uucore::util_name()
-        );
+        show_error!("ignoring --no-newline with multiple arguments");
         no_newline = false;
     }
 
@@ -85,12 +83,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                 Ok(path) => show(&path, no_newline, use_zero),
                 Err(err) => {
                     if verbose {
-                        eprintln!(
-                            "{}: {}: errno {}",
-                            uucore::util_name(),
-                            f,
-                            err.raw_os_error().unwrap()
-                        );
+                        show_error!("{}: errno {}", f.maybe_quote(), err.raw_os_error().unwrap());
                     }
                     return 1;
                 }
@@ -100,12 +93,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                 Ok(path) => show(&path, no_newline, use_zero),
                 Err(err) => {
                     if verbose {
-                        eprintln!(
-                            "{}: {}: errno {:?}",
-                            uucore::util_name(),
-                            f,
-                            err.raw_os_error().unwrap()
-                        );
+                        show_error!("{}: errno {}", f.maybe_quote(), err.raw_os_error().unwrap());
                     }
                     return 1;
                 }

src/uu/realpath/src/realpath.rs

@@ -11,8 +11,14 @@
 extern crate uucore;
 
 use clap::{crate_version, App, Arg};
-use std::path::{Path, PathBuf};
-use uucore::fs::{canonicalize, MissingHandling, ResolveMode};
+use std::{
+    io::{stdout, Write},
+    path::{Path, PathBuf},
+};
+use uucore::{
+    display::{print_verbatim, Quotable},
+    fs::{canonicalize, MissingHandling, ResolveMode},
+};
 
 static ABOUT: &str = "print the resolved path";
 
@@ -58,7 +64,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     for path in &paths {
         if let Err(e) = resolve_path(path, strip, zero, logical, can_mode) {
             if !quiet {
-                show_error!("{}: {}", e, path.display());
+                show_error!("{}: {}", path.maybe_quote(), e);
             }
             retcode = 1
         };
@@ -154,8 +160,9 @@ fn resolve_path(
         ResolveMode::Physical
     };
     let abs = canonicalize(p, can_mode, resolve)?;
-    let line_ending = if zero { '\0' } else { '\n' };
+    let line_ending = if zero { b'\0' } else { b'\n' };
 
-    print!("{}{}", abs.display(), line_ending);
+    print_verbatim(&abs)?;
+    stdout().write_all(&[line_ending])?;
     Ok(())
 }

src/uu/relpath/src/relpath.rs

@@ -10,6 +10,7 @@
 use clap::{crate_version, App, Arg};
 use std::env;
 use std::path::{Path, PathBuf};
+use uucore::display::println_verbatim;
 use uucore::fs::{canonicalize, MissingHandling, ResolveMode};
 use uucore::InvalidEncodingHandling;
 
@@ -48,7 +49,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         if !absto.as_path().starts_with(absbase.as_path())
             || !absfrom.as_path().starts_with(absbase.as_path())
         {
-            println!("{}", absto.display());
+            println_verbatim(absto).unwrap();
             return 0;
         }
     }
@@ -74,7 +75,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         .map(|x| result.push(x.as_os_str()))
         .last();
 
-    println!("{}", result.display());
+    println_verbatim(result).unwrap();
     0
 }
 

src/uu/rm/src/rm.rs

@@ -17,6 +17,7 @@ use std::fs;
 use std::io::{stderr, stdin, BufRead, Write};
 use std::ops::BitOr;
 use std::path::{Path, PathBuf};
+use uucore::display::Quotable;
 use walkdir::{DirEntry, WalkDir};
 
 #[derive(Eq, PartialEq, Clone, Copy)]
@@ -236,7 +237,10 @@ fn remove(files: Vec<String>, options: Options) -> bool {
                 // (e.g., permission), even rm -f should fail with
                 // outputting the error, but there's no easy eay.
                 if !options.force {
-                    show_error!("cannot remove '{}': No such file or directory", filename);
+                    show_error!(
+                        "cannot remove {}: No such file or directory",
+                        filename.quote()
+                    );
                     true
                 } else {
                     false
@@ -263,13 +267,9 @@ fn handle_dir(path: &Path, options: &Options) -> bool {
                     // GNU compatibility (rm/fail-eacces.sh)
                     // here, GNU doesn't use some kind of remove_dir_all
                     // It will show directory+file
-                    show_error!(
-                        "cannot remove '{}': {}",
-                        path.display(),
-                        "Permission denied"
-                    );
+                    show_error!("cannot remove {}: {}", path.quote(), "Permission denied");
                 } else {
-                    show_error!("cannot remove '{}': {}", path.display(), e);
+                    show_error!("cannot remove {}: {}", path.quote(), e);
                 }
             }
         } else {
@@ -287,7 +287,7 @@ fn handle_dir(path: &Path, options: &Options) -> bool {
                     }
                     Err(e) => {
                         had_err = true;
-                        show_error!("recursing in '{}': {}", path.display(), e);
+                        show_error!("recursing in {}: {}", path.quote(), e);
                     }
                 }
             }
@@ -299,12 +299,12 @@ fn handle_dir(path: &Path, options: &Options) -> bool {
     } else if options.dir && (!is_root || !options.preserve_root) {
         had_err = remove_dir(path, options).bitor(had_err);
     } else if options.recursive {
-        show_error!("could not remove directory '{}'", path.display());
+        show_error!("could not remove directory {}", path.quote());
         had_err = true;
     } else {
         show_error!(
-            "cannot remove '{}': Is a directory", // GNU's rm error message does not include help
-            path.display()
+            "cannot remove {}: Is a directory", // GNU's rm error message does not include help
+            path.quote()
         );
         had_err = true;
     }
@@ -325,36 +325,36 @@ fn remove_dir(path: &Path, options: &Options) -> bool {
                     match fs::remove_dir(path) {
                         Ok(_) => {
                             if options.verbose {
-                                println!("removed directory '{}'", normalize(path).display());
+                                println!("removed directory {}", normalize(path).quote());
                             }
                         }
                         Err(e) => {
                             if e.kind() == std::io::ErrorKind::PermissionDenied {
                                 // GNU compatibility (rm/fail-eacces.sh)
                                 show_error!(
-                                    "cannot remove '{}': {}",
-                                    path.display(),
+                                    "cannot remove {}: {}",
+                                    path.quote(),
                                     "Permission denied"
                                 );
                             } else {
-                                show_error!("cannot remove '{}': {}", path.display(), e);
+                                show_error!("cannot remove {}: {}", path.quote(), e);
                             }
                             return true;
                         }
                     }
                 } else {
                     // directory can be read but is not empty
-                    show_error!("cannot remove '{}': Directory not empty", path.display());
+                    show_error!("cannot remove {}: Directory not empty", path.quote());
                     return true;
                 }
             } else {
                 // called to remove a symlink_dir (windows) without "-r"/"-R" or "-d"
-                show_error!("cannot remove '{}': Is a directory", path.display());
+                show_error!("cannot remove {}: Is a directory", path.quote());
                 return true;
             }
         } else {
             // GNU's rm shows this message if directory is empty but not readable
-            show_error!("cannot remove '{}': Directory not empty", path.display());
+            show_error!("cannot remove {}: Directory not empty", path.quote());
             return true;
         }
     }
@@ -372,19 +372,15 @@ fn remove_file(path: &Path, options: &Options) -> bool {
         match fs::remove_file(path) {
             Ok(_) => {
                 if options.verbose {
-                    println!("removed '{}'", normalize(path).display());
+                    println!("removed {}", normalize(path).quote());
                 }
             }
             Err(e) => {
                 if e.kind() == std::io::ErrorKind::PermissionDenied {
                     // GNU compatibility (rm/fail-eacces.sh)
-                    show_error!(
-                        "cannot remove '{}': {}",
-                        path.display(),
-                        "Permission denied"
-                    );
+                    show_error!("cannot remove {}: {}", path.quote(), "Permission denied");
                 } else {
-                    show_error!("cannot remove '{}': {}", path.display(), e);
+                    show_error!("cannot remove {}: {}", path.quote(), e);
                 }
                 return true;
             }
@@ -396,9 +392,9 @@ fn remove_file(path: &Path, options: &Options) -> bool {
 
 fn prompt_file(path: &Path, is_dir: bool) -> bool {
     if is_dir {
-        prompt(&(format!("rm: remove directory '{}'? ", path.display())))
+        prompt(&(format!("rm: remove directory {}? ", path.quote())))
     } else {
-        prompt(&(format!("rm: remove file '{}'? ", path.display())))
+        prompt(&(format!("rm: remove file {}? ", path.quote())))
     }
 }
 

src/uu/runcon/src/errors.rs

@@ -3,6 +3,8 @@ use std::fmt::Write;
 use std::io;
 use std::str::Utf8Error;
 
+use uucore::display::Quotable;
+
 pub(crate) type Result<T> = std::result::Result<T, Error>;
 
 #[derive(thiserror::Error, Debug)]
@@ -31,7 +33,7 @@ pub(crate) enum Error {
         source: io::Error,
     },
 
-    #[error("{operation} failed on '{}'", .operand1.to_string_lossy())]
+    #[error("{operation} failed on {}", .operand1.quote())]
     Io1 {
         operation: &'static str,
         operand1: OsString,

src/uu/seq/src/seq.rs

@@ -14,6 +14,7 @@ use num_traits::{Num, ToPrimitive};
 use std::cmp;
 use std::io::{stdout, Write};
 use std::str::FromStr;
+use uucore::display::Quotable;
 
 static ABOUT: &str = "Display numbers from FIRST to LAST, in steps of INCREMENT.";
 static OPT_SEPARATOR: &str = "separator";
@@ -115,14 +116,14 @@ impl FromStr for Number {
             }
             Err(_) => match s.parse::<f64>() {
                 Ok(value) if value.is_nan() => Err(format!(
-                    "invalid 'not-a-number' argument: '{}'\nTry '{} --help' for more information.",
-                    s,
+                    "invalid 'not-a-number' argument: {}\nTry '{} --help' for more information.",
+                    s.quote(),
                     uucore::execution_phrase(),
                 )),
                 Ok(value) => Ok(Number::F64(value)),
                 Err(_) => Err(format!(
-                    "invalid floating point argument: '{}'\nTry '{} --help' for more information.",
-                    s,
+                    "invalid floating point argument: {}\nTry '{} --help' for more information.",
+                    s.quote(),
                     uucore::execution_phrase(),
                 )),
             },

src/uu/shred/src/shred.rs

@@ -18,12 +18,12 @@ use std::io;
 use std::io::prelude::*;
 use std::io::SeekFrom;
 use std::path::{Path, PathBuf};
-use uucore::InvalidEncodingHandling;
+use uucore::display::Quotable;
+use uucore::{util_name, InvalidEncodingHandling};
 
 #[macro_use]
 extern crate uucore;
 
-static NAME: &str = "shred";
 const BLOCK_SIZE: usize = 512;
 const NAME_CHARSET: &[u8] = b"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_.";
 
@@ -281,7 +281,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
 
     if !matches.is_present(options::FILE) {
         show_error!("Missing an argument");
-        show_error!("For help, try '{} --help'", NAME);
+        show_error!("For help, try '{} --help'", uucore::execution_phrase());
         return 0;
     }
 
@@ -289,7 +289,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         Some(s) => match s.parse::<usize>() {
             Ok(u) => u,
             Err(_) => {
-                errs.push(format!("invalid number of passes: '{}'", s));
+                errs.push(format!("invalid number of passes: {}", s.quote()));
                 0
             }
         },
@@ -414,7 +414,11 @@ fn get_size(size_str_opt: Option<String>) -> Option<u64> {
     let coefficient = match size_str.parse::<u64>() {
         Ok(u) => u,
         Err(_) => {
-            println!("{}: {}: Invalid file size", NAME, size_str_opt.unwrap());
+            println!(
+                "{}: {}: Invalid file size",
+                util_name(),
+                size_str_opt.unwrap().maybe_quote()
+            );
             exit!(1);
         }
     };
@@ -452,11 +456,11 @@ fn wipe_file(
     // Get these potential errors out of the way first
     let path: &Path = Path::new(path_str);
     if !path.exists() {
-        show_error!("{}: No such file or directory", path.display());
+        show_error!("{}: No such file or directory", path.maybe_quote());
         return;
     }
     if !path.is_file() {
-        show_error!("{}: Not a file", path.display());
+        show_error!("{}: Not a file", path.maybe_quote());
         return;
     }
 
@@ -520,7 +524,7 @@ fn wipe_file(
         let mut file: File = match OpenOptions::new().write(true).truncate(false).open(path) {
             Ok(f) => f,
             Err(e) => {
-                show_error!("{}: failed to open for writing: {}", path.display(), e);
+                show_error!("{}: failed to open for writing: {}", path.maybe_quote(), e);
                 return;
             }
         };
@@ -535,8 +539,8 @@ fn wipe_file(
                 if total_passes.to_string().len() == 1 {
                     println!(
                         "{}: {}: pass {}/{} ({})... ",
-                        NAME,
-                        path.display(),
+                        util_name(),
+                        path.maybe_quote(),
                         i + 1,
                         total_passes,
                         pass_name
@@ -544,8 +548,8 @@ fn wipe_file(
                 } else {
                     println!(
                         "{}: {}: pass {:2.0}/{:2.0} ({})... ",
-                        NAME,
-                        path.display(),
+                        util_name(),
+                        path.maybe_quote(),
                         i + 1,
                         total_passes,
                         pass_name
@@ -556,7 +560,7 @@ fn wipe_file(
             match do_pass(&mut file, path, &mut generator, *pass_type, size) {
                 Ok(_) => {}
                 Err(e) => {
-                    show_error!("{}: File write pass failed: {}", path.display(), e);
+                    show_error!("{}: File write pass failed: {}", path.maybe_quote(), e);
                 }
             }
             // Ignore failed writes; just keep trying
@@ -567,7 +571,7 @@ fn wipe_file(
         match do_remove(path, path_str, verbose) {
             Ok(_) => {}
             Err(e) => {
-                show_error!("{}: failed to remove file: {}", path.display(), e);
+                show_error!("{}: failed to remove file: {}", path.maybe_quote(), e);
             }
         }
     }
@@ -622,9 +626,9 @@ fn wipe_name(orig_path: &Path, verbose: bool) -> Option<PathBuf> {
                     if verbose {
                         println!(
                             "{}: {}: renamed to {}",
-                            NAME,
-                            last_path.display(),
-                            new_path.display()
+                            util_name(),
+                            last_path.maybe_quote(),
+                            new_path.quote()
                         );
                     }
 
@@ -641,9 +645,9 @@ fn wipe_name(orig_path: &Path, verbose: bool) -> Option<PathBuf> {
                 Err(e) => {
                     println!(
                         "{}: {}: Couldn't rename to {}: {}",
-                        NAME,
-                        last_path.display(),
-                        new_path.display(),
+                        util_name(),
+                        last_path.maybe_quote(),
+                        new_path.quote(),
                         e
                     );
                     return None;
@@ -657,7 +661,7 @@ fn wipe_name(orig_path: &Path, verbose: bool) -> Option<PathBuf> {
 
 fn do_remove(path: &Path, orig_filename: &str, verbose: bool) -> Result<(), io::Error> {
     if verbose {
-        println!("{}: {}: removing", NAME, orig_filename);
+        println!("{}: {}: removing", util_name(), orig_filename.maybe_quote());
     }
 
     let renamed_path: Option<PathBuf> = wipe_name(path, verbose);
@@ -666,7 +670,7 @@ fn do_remove(path: &Path, orig_filename: &str, verbose: bool) -> Result<(), io::
     }
 
     if verbose {
-        println!("{}: {}: removed", NAME, orig_filename);
+        println!("{}: {}: removed", util_name(), orig_filename.maybe_quote());
     }
 
     Ok(())

src/uu/shuf/src/shuf.rs

@@ -14,6 +14,7 @@ use clap::{crate_version, App, Arg};
 use rand::Rng;
 use std::fs::File;
 use std::io::{stdin, stdout, BufReader, BufWriter, Read, Write};
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 enum Mode {
@@ -76,7 +77,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
             Some(count) => match count.parse::<usize>() {
                 Ok(val) => val,
                 Err(_) => {
-                    show_error!("invalid line count: '{}'", count);
+                    show_error!("invalid line count: {}", count.quote());
                     return 1;
                 }
             },
@@ -185,13 +186,13 @@ fn read_input_file(filename: &str) -> Vec<u8> {
     } else {
         match File::open(filename) {
             Ok(f) => Box::new(f) as Box<dyn Read>,
-            Err(e) => crash!(1, "failed to open '{}': {}", filename, e),
+            Err(e) => crash!(1, "failed to open {}: {}", filename.quote(), e),
         }
     });
 
     let mut data = Vec::new();
     if let Err(e) = file.read_to_end(&mut data) {
-        crash!(1, "failed reading '{}': {}", filename, e)
+        crash!(1, "failed reading {}: {}", filename.quote(), e)
     };
 
     data
@@ -235,7 +236,7 @@ fn shuf_bytes(input: &mut Vec<&[u8]>, opts: Options) {
         None => Box::new(stdout()) as Box<dyn Write>,
         Some(s) => match File::create(&s[..]) {
             Ok(f) => Box::new(f) as Box<dyn Write>,
-            Err(e) => crash!(1, "failed to open '{}' for writing: {}", &s[..], e),
+            Err(e) => crash!(1, "failed to open {} for writing: {}", s.quote(), e),
         },
     });
 
@@ -243,7 +244,7 @@ fn shuf_bytes(input: &mut Vec<&[u8]>, opts: Options) {
         Some(r) => WrappedRng::RngFile(rand::rngs::adapter::ReadRng::new(
             match File::open(&r[..]) {
                 Ok(f) => f,
-                Err(e) => crash!(1, "failed to open random source '{}': {}", &r[..], e),
+                Err(e) => crash!(1, "failed to open random source {}: {}", r.quote(), e),
             },
         )),
         None => WrappedRng::RngDefault(rand::thread_rng()),
@@ -288,14 +289,14 @@ fn shuf_bytes(input: &mut Vec<&[u8]>, opts: Options) {
 fn parse_range(input_range: &str) -> Result<(usize, usize), String> {
     let split: Vec<&str> = input_range.split('-').collect();
     if split.len() != 2 {
-        Err(format!("invalid input range: '{}'", input_range))
+        Err(format!("invalid input range: {}", input_range.quote()))
     } else {
         let begin = split[0]
             .parse::<usize>()
-            .map_err(|_| format!("invalid input range: '{}'", split[0]))?;
+            .map_err(|_| format!("invalid input range: {}", split[0].quote()))?;
         let end = split[1]
             .parse::<usize>()
-            .map_err(|_| format!("invalid input range: '{}'", split[1]))?;
+            .map_err(|_| format!("invalid input range: {}", split[1].quote()))?;
         Ok((begin, end + 1))
     }
 }

src/uu/sort/src/sort.rs

@@ -45,6 +45,7 @@ use std::path::Path;
 use std::path::PathBuf;
 use std::str::Utf8Error;
 use unicode_width::UnicodeWidthStr;
+use uucore::display::Quotable;
 use uucore::error::{set_exit_code, strip_errno, UError, UResult, USimpleError, UUsageError};
 use uucore::parse_size::{parse_size, ParseSizeError};
 use uucore::version_cmp::version_cmp;
@@ -139,7 +140,7 @@ enum SortError {
         error: std::io::Error,
     },
     ReadFailed {
-        path: String,
+        path: PathBuf,
         error: std::io::Error,
     },
     ParseKeyError {
@@ -189,7 +190,7 @@ impl Display for SortError {
                     write!(
                         f,
                         "{}:{}: disorder: {}",
-                        file.to_string_lossy(),
+                        file.maybe_quote(),
                         line_number,
                         line
                     )
@@ -198,13 +199,23 @@ impl Display for SortError {
                 }
             }
             SortError::OpenFailed { path, error } => {
-                write!(f, "open failed: {}: {}", path, strip_errno(error))
+                write!(
+                    f,
+                    "open failed: {}: {}",
+                    path.maybe_quote(),
+                    strip_errno(error)
+                )
             }
             SortError::ParseKeyError { key, msg } => {
-                write!(f, "failed to parse key `{}`: {}", key, msg)
+                write!(f, "failed to parse key {}: {}", key.quote(), msg)
             }
             SortError::ReadFailed { path, error } => {
-                write!(f, "cannot read: {}: {}", path, strip_errno(error))
+                write!(
+                    f,
+                    "cannot read: {}: {}",
+                    path.maybe_quote(),
+                    strip_errno(error)
+                )
             }
             SortError::OpenTmpFileFailed { error } => {
                 write!(f, "failed to open temporary file: {}", strip_errno(error))
@@ -213,7 +224,7 @@ impl Display for SortError {
                 write!(f, "couldn't execute compress program: errno {}", code)
             }
             SortError::CompressProgTerminatedAbnormally { prog } => {
-                write!(f, "'{}' terminated abnormally", prog)
+                write!(f, "{} terminated abnormally", prog.quote())
             }
             SortError::TmpDirCreationFailed => write!(f, "could not create temporary directory"),
             SortError::Uft8Error { error } => write!(f, "{}", error),
@@ -756,19 +767,19 @@ impl KeyPosition {
 
         let field = field_and_char
             .next()
-            .ok_or_else(|| format!("invalid key `{}`", key))?;
+            .ok_or_else(|| format!("invalid key {}", key.quote()))?;
         let char = field_and_char.next();
 
         let field = field
             .parse()
-            .map_err(|e| format!("failed to parse field index `{}`: {}", field, e))?;
+            .map_err(|e| format!("failed to parse field index {}: {}", field.quote(), e))?;
         if field == 0 {
             return Err("field index can not be 0".to_string());
         }
 
         let char = char.map_or(Ok(default_char_index), |char| {
             char.parse()
-                .map_err(|e| format!("failed to parse character index `{}`: {}", char, e))
+                .map_err(|e| format!("failed to parse character index {}: {}", char.quote(), e))
         })?;
 
         Ok(Self {
@@ -789,7 +800,7 @@ impl Default for KeyPosition {
     }
 }
 
-#[derive(Clone, PartialEq, Debug)]
+#[derive(Clone, PartialEq, Debug, Default)]
 struct FieldSelector {
     from: KeyPosition,
     to: Option<KeyPosition>,
@@ -801,18 +812,6 @@ struct FieldSelector {
     needs_selection: bool,
 }
 
-impl Default for FieldSelector {
-    fn default() -> Self {
-        Self {
-            from: Default::default(),
-            to: None,
-            settings: Default::default(),
-            needs_tokens: false,
-            needs_selection: false,
-        }
-    }
-}
-
 impl FieldSelector {
     /// Splits this position into the actual position and the attached options.
     fn split_key_options(position: &str) -> (&str, &str) {
@@ -879,7 +878,7 @@ impl FieldSelector {
                     'R' => key_settings.set_sort_mode(SortMode::Random)?,
                     'r' => key_settings.reverse = true,
                     'V' => key_settings.set_sort_mode(SortMode::Version)?,
-                    c => return Err(format!("invalid option: `{}`", c)),
+                    c => return Err(format!("invalid option: '{}'", c)),
                 }
             }
             Ok(ignore_blanks)
@@ -1179,7 +1178,10 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
     if let Some(n_merge) = matches.value_of(options::BATCH_SIZE) {
         settings.merge_batch_size = n_merge.parse().map_err(|_| {
-            UUsageError::new(2, format!("invalid --batch-size argument '{}'", n_merge))
+            UUsageError::new(
+                2,
+                format!("invalid --batch-size argument {}", n_merge.quote()),
+            )
         })?;
     }
 
@@ -1211,23 +1213,30 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     } else if settings.check && files.len() != 1 {
         return Err(UUsageError::new(
             2,
-            format!(
-                "extra operand `{}' not allowed with -c",
-                files[1].to_string_lossy()
-            ),
+            format!("extra operand {} not allowed with -c", files[1].quote()),
         ));
     }
 
     if let Some(arg) = matches.args.get(options::SEPARATOR) {
-        let separator = arg.vals[0].to_string_lossy();
-        let mut separator = separator.as_ref();
+        let mut separator = arg.vals[0].to_str().ok_or_else(|| {
+            UUsageError::new(
+                2,
+                format!("separator is not valid unicode: {}", arg.vals[0].quote()),
+            )
+        })?;
         if separator == "\\0" {
             separator = "\0";
         }
+        // This rejects non-ASCII codepoints, but perhaps we don't have to.
+        // On the other hand GNU accepts any single byte, valid unicode or not.
+        // (Supporting multi-byte chars would require changes in tokenize_with_separator().)
         if separator.len() != 1 {
             return Err(UUsageError::new(
                 2,
-                "separator must be exactly one character long",
+                format!(
+                    "separator must be exactly one character long: {}",
+                    separator.quote()
+                ),
             ));
         }
         settings.separator = Some(separator.chars().next().unwrap())
@@ -1816,7 +1825,7 @@ fn open(path: impl AsRef<OsStr>) -> UResult<Box<dyn Read + Send>> {
     match File::open(path) {
         Ok(f) => Ok(Box::new(f) as Box<dyn Read + Send>),
         Err(error) => Err(SortError::ReadFailed {
-            path: path.to_string_lossy().to_string(),
+            path: path.to_owned(),
             error,
         }
         .into()),
@@ -1828,8 +1837,8 @@ fn format_error_message(error: ParseSizeError, s: &str, option: &str) -> String
     // GNU's sort echos affected flag, -S or --buffer-size, depending user's selection
     // GNU's sort does distinguish between "invalid (suffix in) argument"
     match error {
-        ParseSizeError::ParseFailure(_) => format!("invalid --{} argument '{}'", option, s),
-        ParseSizeError::SizeTooBig(_) => format!("--{} argument '{}' too large", option, s),
+        ParseSizeError::ParseFailure(_) => format!("invalid --{} argument {}", option, s.quote()),
+        ParseSizeError::SizeTooBig(_) => format!("--{} argument {} too large", option, s.quote()),
     }
 }
 

src/uu/split/src/split.rs

@@ -19,6 +19,7 @@ use std::fs::File;
 use std::io::{stdin, BufRead, BufReader, BufWriter, Read, Write};
 use std::path::Path;
 use std::{char, fs::remove_file};
+use uucore::display::Quotable;
 use uucore::parse_size::parse_size;
 
 static OPT_BYTES: &str = "bytes";
@@ -238,7 +239,11 @@ impl LineSplitter {
     fn new(settings: &Settings) -> LineSplitter {
         LineSplitter {
             lines_per_split: settings.strategy_param.parse().unwrap_or_else(|_| {
-                crash!(1, "invalid number of lines: '{}'", settings.strategy_param)
+                crash!(
+                    1,
+                    "invalid number of lines: {}",
+                    settings.strategy_param.quote()
+                )
             }),
         }
     }
@@ -373,8 +378,8 @@ fn split(settings: &Settings) -> i32 {
         let r = File::open(Path::new(&settings.input)).unwrap_or_else(|_| {
             crash!(
                 1,
-                "cannot open '{}' for reading: No such file or directory",
-                settings.input
+                "cannot open {} for reading: No such file or directory",
+                settings.input.quote()
             )
         });
         Box::new(r) as Box<dyn Read>
@@ -383,7 +388,7 @@ fn split(settings: &Settings) -> i32 {
     let mut splitter: Box<dyn Splitter> = match settings.strategy.as_str() {
         s if s == OPT_LINES => Box::new(LineSplitter::new(settings)),
         s if (s == OPT_BYTES || s == OPT_LINE_BYTES) => Box::new(ByteSplitter::new(settings)),
-        a => crash!(1, "strategy {} not supported", a),
+        a => crash!(1, "strategy {} not supported", a.quote()),
     };
 
     let mut fileno = 0;

src/uu/stat/src/stat.rs

@@ -7,6 +7,7 @@
 
 #[macro_use]
 extern crate uucore;
+use uucore::display::Quotable;
 use uucore::entries;
 use uucore::fs::display_permissions;
 use uucore::fsext::{
@@ -24,7 +25,7 @@ use std::{cmp, fs, iter};
 macro_rules! check_bound {
     ($str: ident, $bound:expr, $beg: expr, $end: expr) => {
         if $end >= $bound {
-            return Err(format!("'{}': invalid directive", &$str[$beg..$end]));
+            return Err(format!("{}: invalid directive", $str[$beg..$end].quote()));
         }
     };
 }
@@ -652,11 +653,7 @@ impl Stater {
                                                     return 1;
                                                 }
                                             };
-                                            arg = format!(
-                                                "`{}' -> `{}'",
-                                                file,
-                                                dst.to_string_lossy()
-                                            );
+                                            arg = format!("{} -> {}", file.quote(), dst.quote());
                                         } else {
                                             arg = file.to_string();
                                         }
@@ -750,7 +747,7 @@ impl Stater {
                     }
                 }
                 Err(e) => {
-                    show_error!("cannot stat '{}': {}", file, e);
+                    show_error!("cannot stat {}: {}", file.quote(), e);
                     return 1;
                 }
             }
@@ -843,7 +840,11 @@ impl Stater {
                     }
                 }
                 Err(e) => {
-                    show_error!("cannot read file system information for '{}': {}", file, e);
+                    show_error!(
+                        "cannot read file system information for {}: {}",
+                        file.quote(),
+                        e
+                    );
                     return 1;
                 }
             }

src/uu/sum/src/sum.rs

@@ -14,6 +14,7 @@ use clap::{crate_version, App, Arg};
 use std::fs::File;
 use std::io::{stdin, Read, Result};
 use std::path::Path;
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 static NAME: &str = "sum";
@@ -118,7 +119,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         let reader = match open(file) {
             Ok(f) => f,
             Err(error) => {
-                show_error!("'{}' {}", file, error);
+                show_error!("{}: {}", file.maybe_quote(), error);
                 exit_code = 2;
                 continue;
             }

src/uu/sync/src/sync.rs

@@ -14,6 +14,7 @@ extern crate uucore;
 
 use clap::{crate_version, App, Arg};
 use std::path::Path;
+use uucore::display::Quotable;
 
 static EXIT_ERR: i32 = 1;
 
@@ -175,7 +176,11 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
 
     for f in &files {
         if !Path::new(&f).exists() {
-            crash!(EXIT_ERR, "cannot stat '{}': No such file or directory", f);
+            crash!(
+                EXIT_ERR,
+                "cannot stat {}: No such file or directory",
+                f.quote()
+            );
         }
     }
 

src/uu/tac/src/tac.rs

@@ -14,6 +14,7 @@ use clap::{crate_version, App, Arg};
 use memchr::memmem;
 use std::io::{stdin, stdout, BufReader, Read, Write};
 use std::{fs::File, path::Path};
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 static NAME: &str = "tac";
@@ -141,11 +142,11 @@ fn tac(filenames: Vec<String>, before: bool, _: bool, separator: &str) -> i32 {
             let path = Path::new(filename);
             if path.is_dir() || path.metadata().is_err() {
                 if path.is_dir() {
-                    show_error!("{}: read error: Invalid argument", filename);
+                    show_error!("{}: read error: Invalid argument", filename.maybe_quote());
                 } else {
                     show_error!(
-                        "failed to open '{}' for reading: No such file or directory",
-                        filename
+                        "failed to open {} for reading: No such file or directory",
+                        filename.quote()
                     );
                 }
                 exit_code = 1;
@@ -154,7 +155,7 @@ fn tac(filenames: Vec<String>, before: bool, _: bool, separator: &str) -> i32 {
             match File::open(path) {
                 Ok(f) => Box::new(f) as Box<dyn Read>,
                 Err(e) => {
-                    show_error!("failed to open '{}' for reading: {}", filename, e);
+                    show_error!("failed to open {} for reading: {}", filename.quote(), e);
                     exit_code = 1;
                     continue;
                 }
@@ -163,7 +164,7 @@ fn tac(filenames: Vec<String>, before: bool, _: bool, separator: &str) -> i32 {
 
         let mut data = Vec::new();
         if let Err(e) = file.read_to_end(&mut data) {
-            show_error!("failed to read '{}': {}", filename, e);
+            show_error!("failed to read {}: {}", filename.quote(), e);
             exit_code = 1;
             continue;
         };

src/uu/tee/src/tee.rs

@@ -12,7 +12,8 @@ use clap::{crate_version, App, Arg};
 use retain_mut::RetainMut;
 use std::fs::OpenOptions;
 use std::io::{copy, sink, stdin, stdout, Error, ErrorKind, Read, Result, Write};
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
+use uucore::display::Quotable;
 
 #[cfg(unix)]
 use uucore::libc;
@@ -167,7 +168,7 @@ impl Write for MultiWriter {
             let result = writer.write_all(buf);
             match result {
                 Err(f) => {
-                    show_error!("{}: {}", writer.name, f.to_string());
+                    show_error!("{}: {}", writer.name.maybe_quote(), f);
                     false
                 }
                 _ => true,
@@ -181,7 +182,7 @@ impl Write for MultiWriter {
             let result = writer.flush();
             match result {
                 Err(f) => {
-                    show_error!("{}: {}", writer.name, f.to_string());
+                    show_error!("{}: {}", writer.name.maybe_quote(), f);
                     false
                 }
                 _ => true,
@@ -214,7 +215,7 @@ impl Read for NamedReader {
     fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
         match self.inner.read(buf) {
             Err(f) => {
-                show_error!("{}: {}", Path::new("stdin").display(), f.to_string());
+                show_error!("stdin: {}", f);
                 Err(f)
             }
             okay => okay,

src/uu/test/src/parser.rs

@@ -10,6 +10,9 @@
 use std::ffi::OsString;
 use std::iter::Peekable;
 
+use uucore::display::Quotable;
+use uucore::show_error;
+
 /// Represents one of the binary comparison operators for strings, integers, or files
 #[derive(Debug, PartialEq)]
 pub enum Operator {
@@ -43,19 +46,22 @@ impl Symbol {
     /// Returns Symbol::None in place of None
     fn new(token: Option<OsString>) -> Symbol {
         match token {
-            Some(s) => match s.to_string_lossy().as_ref() {
-                "(" => Symbol::LParen,
-                "!" => Symbol::Bang,
-                "-a" | "-o" => Symbol::BoolOp(s),
-                "=" | "==" | "!=" => Symbol::Op(Operator::String(s)),
-                "-eq" | "-ge" | "-gt" | "-le" | "-lt" | "-ne" => Symbol::Op(Operator::Int(s)),
-                "-ef" | "-nt" | "-ot" => Symbol::Op(Operator::File(s)),
-                "-n" | "-z" => Symbol::UnaryOp(UnaryOperator::StrlenOp(s)),
-                "-b" | "-c" | "-d" | "-e" | "-f" | "-g" | "-G" | "-h" | "-k" | "-L" | "-O"
-                | "-p" | "-r" | "-s" | "-S" | "-t" | "-u" | "-w" | "-x" => {
-                    Symbol::UnaryOp(UnaryOperator::FiletestOp(s))
-                }
-                _ => Symbol::Literal(s),
+            Some(s) => match s.to_str() {
+                Some(t) => match t {
+                    "(" => Symbol::LParen,
+                    "!" => Symbol::Bang,
+                    "-a" | "-o" => Symbol::BoolOp(s),
+                    "=" | "==" | "!=" => Symbol::Op(Operator::String(s)),
+                    "-eq" | "-ge" | "-gt" | "-le" | "-lt" | "-ne" => Symbol::Op(Operator::Int(s)),
+                    "-ef" | "-nt" | "-ot" => Symbol::Op(Operator::File(s)),
+                    "-n" | "-z" => Symbol::UnaryOp(UnaryOperator::StrlenOp(s)),
+                    "-b" | "-c" | "-d" | "-e" | "-f" | "-g" | "-G" | "-h" | "-k" | "-L" | "-O"
+                    | "-p" | "-r" | "-s" | "-S" | "-t" | "-u" | "-w" | "-x" => {
+                        Symbol::UnaryOp(UnaryOperator::FiletestOp(s))
+                    }
+                    _ => Symbol::Literal(s),
+                },
+                None => Symbol::Literal(s),
             },
             None => Symbol::None,
         }
@@ -202,7 +208,7 @@ impl Parser {
 
             // case 2: error if end of stream is `( <any_token>`
             [symbol] => {
-                eprintln!("test: missing argument after ‘{:?}’", symbol);
+                show_error!("missing argument after ‘{:?}’", symbol);
                 std::process::exit(2);
             }
 
@@ -391,7 +397,7 @@ impl Parser {
         self.expr();
 
         match self.tokens.next() {
-            Some(token) => Err(format!("extra argument '{}'", token.to_string_lossy())),
+            Some(token) => Err(format!("extra argument {}", token.quote())),
             None => Ok(()),
         }
     }

src/uu/test/src/test.rs

@@ -13,7 +13,7 @@ mod parser;
 use clap::{crate_version, App, AppSettings};
 use parser::{parse, Operator, Symbol, UnaryOperator};
 use std::ffi::{OsStr, OsString};
-use std::path::Path;
+use uucore::{display::Quotable, show_error};
 
 const USAGE: &str = "test EXPRESSION
 or:  test
@@ -93,10 +93,7 @@ pub fn uu_app() -> App<'static, 'static> {
 
 pub fn uumain(mut args: impl uucore::Args) -> i32 {
     let program = args.next().unwrap_or_else(|| OsString::from("test"));
-    let binary_name = Path::new(&program)
-        .file_name()
-        .unwrap_or_else(|| OsStr::new("test"))
-        .to_string_lossy();
+    let binary_name = uucore::util_name();
     let mut args: Vec<_> = args.collect();
 
     if binary_name.ends_with('[') {
@@ -116,8 +113,8 @@ pub fn uumain(mut args: impl uucore::Args) -> i32 {
         }
         // If invoked via name '[', matching ']' must be in the last arg
         let last = args.pop();
-        if last != Some(OsString::from("]")) {
-            eprintln!("[: missing ']'");
+        if last.as_deref() != Some(OsStr::new("]")) {
+            show_error!("missing ']'");
             return 2;
         }
     }
@@ -133,7 +130,7 @@ pub fn uumain(mut args: impl uucore::Args) -> i32 {
             }
         }
         Err(e) => {
-            eprintln!("test: {}", e);
+            show_error!("{}", e);
             2
         }
     }
@@ -190,11 +187,11 @@ fn eval(stack: &mut Vec<Symbol>) -> Result<bool, String> {
             })
         }
         Some(Symbol::UnaryOp(UnaryOperator::FiletestOp(op))) => {
-            let op = op.to_string_lossy();
+            let op = op.to_str().unwrap();
 
             let f = pop_literal!();
 
-            Ok(match op.as_ref() {
+            Ok(match op {
                 "-b" => path(&f, PathCondition::BlockSpecial),
                 "-c" => path(&f, PathCondition::CharacterSpecial),
                 "-d" => path(&f, PathCondition::Directory),
@@ -231,31 +228,33 @@ fn eval(stack: &mut Vec<Symbol>) -> Result<bool, String> {
 }
 
 fn integers(a: &OsStr, b: &OsStr, op: &OsStr) -> Result<bool, String> {
-    let format_err = |value| format!("invalid integer '{}'", value);
+    let format_err = |value: &OsStr| format!("invalid integer {}", value.quote());
 
-    let a = a.to_string_lossy();
-    let a: i64 = a.parse().map_err(|_| format_err(a))?;
+    let a: i64 = a
+        .to_str()
+        .and_then(|s| s.parse().ok())
+        .ok_or_else(|| format_err(a))?;
 
-    let b = b.to_string_lossy();
-    let b: i64 = b.parse().map_err(|_| format_err(b))?;
+    let b: i64 = b
+        .to_str()
+        .and_then(|s| s.parse().ok())
+        .ok_or_else(|| format_err(b))?;
 
-    let operator = op.to_string_lossy();
-    Ok(match operator.as_ref() {
-        "-eq" => a == b,
-        "-ne" => a != b,
-        "-gt" => a > b,
-        "-ge" => a >= b,
-        "-lt" => a < b,
-        "-le" => a <= b,
-        _ => return Err(format!("unknown operator '{}'", operator)),
+    Ok(match op.to_str() {
+        Some("-eq") => a == b,
+        Some("-ne") => a != b,
+        Some("-gt") => a > b,
+        Some("-ge") => a >= b,
+        Some("-lt") => a < b,
+        Some("-le") => a <= b,
+        _ => return Err(format!("unknown operator {}", op.quote())),
     })
 }
 
 fn isatty(fd: &OsStr) -> Result<bool, String> {
-    let fd = fd.to_string_lossy();
-
-    fd.parse()
-        .map_err(|_| format!("invalid integer '{}'", fd))
+    fd.to_str()
+        .and_then(|s| s.parse().ok())
+        .ok_or_else(|| format!("invalid integer {}", fd.quote()))
         .map(|i| {
             #[cfg(not(target_os = "redox"))]
             unsafe {

src/uu/timeout/src/timeout.rs

@@ -16,6 +16,7 @@ use clap::{crate_version, App, AppSettings, Arg};
 use std::io::ErrorKind;
 use std::process::{Command, Stdio};
 use std::time::Duration;
+use uucore::display::Quotable;
 use uucore::process::ChildExt;
 use uucore::signals::{signal_by_name_or_value, signal_name_by_value};
 use uucore::InvalidEncodingHandling;
@@ -61,7 +62,7 @@ impl Config {
                 let signal_result = signal_by_name_or_value(signal_);
                 match signal_result {
                     None => {
-                        unreachable!("invalid signal '{}'", signal_);
+                        unreachable!("invalid signal {}", signal_.quote());
                     }
                     Some(signal_value) => signal_value,
                 }
@@ -216,9 +217,9 @@ fn timeout(
         Ok(None) => {
             if verbose {
                 show_error!(
-                    "sending signal {} to command '{}'",
+                    "sending signal {} to command {}",
                     signal_name_by_value(signal).unwrap(),
-                    cmd[0]
+                    cmd[0].quote()
                 );
             }
             crash_if_err!(ERR_EXIT_STATUS, process.send_signal(signal));
@@ -233,7 +234,7 @@ fn timeout(
                     }
                     Ok(None) => {
                         if verbose {
-                            show_error!("sending signal KILL to command '{}'", cmd[0]);
+                            show_error!("sending signal KILL to command {}", cmd[0].quote());
                         }
                         crash_if_err!(
                             ERR_EXIT_STATUS,

src/uu/touch/src/touch.rs

@@ -6,7 +6,7 @@
 // For the full copyright and license information, please view the LICENSE file
 // that was distributed with this source code.
 
-// spell-checker:ignore (ToDO) filetime strptime utcoff strs datetime MMDDhhmm
+// spell-checker:ignore (ToDO) filetime strptime utcoff strs datetime MMDDhhmm clapv
 
 pub extern crate filetime;
 
@@ -17,6 +17,7 @@ use clap::{crate_version, App, Arg, ArgGroup};
 use filetime::*;
 use std::fs::{self, File};
 use std::path::Path;
+use uucore::display::Quotable;
 use uucore::error::{FromIo, UError, UResult, USimpleError};
 
 static ABOUT: &str = "Update the access and modification times of each FILE to the current time.";
@@ -82,7 +83,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             }
 
             if let Err(e) = File::create(path) {
-                show!(e.map_err_context(|| format!("cannot touch '{}'", path.display())));
+                show!(e.map_err_context(|| format!("cannot touch {}", path.quote())));
                 continue;
             };
 
@@ -122,7 +123,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         } else {
             filetime::set_file_times(path, atime, mtime)
         }
-        .map_err_context(|| format!("setting times of '{}'", path.display()))?;
+        .map_err_context(|| format!("setting times of {}", path.quote()))?;
     }
 
     Ok(())
@@ -175,6 +176,7 @@ pub fn uu_app() -> App<'static, 'static> {
             Arg::with_name(options::sources::REFERENCE)
                 .short("r")
                 .long(options::sources::REFERENCE)
+                .alias("ref") // clapv3
                 .help("use this file's times instead of the current time")
                 .value_name("FILE"),
         )
@@ -209,7 +211,7 @@ fn stat(path: &Path, follow: bool) -> UResult<(FileTime, FileTime)> {
     } else {
         fs::metadata(path)
     }
-    .map_err_context(|| format!("failed to get attributes of '{}'", path.display()))?;
+    .map_err_context(|| format!("failed to get attributes of {}", path.quote()))?;
 
     Ok((
         FileTime::from_last_access_time(&metadata),
@@ -249,11 +251,16 @@ fn parse_timestamp(s: &str) -> UResult<FileTime> {
         10 => ("%y%m%d%H%M", s.to_owned()),
         11 => ("%Y%m%d%H%M.%S", format!("{}{}", now.tm_year + 1900, s)),
         8 => ("%Y%m%d%H%M", format!("{}{}", now.tm_year + 1900, s)),
-        _ => return Err(USimpleError::new(1, format!("invalid date format '{}'", s))),
+        _ => {
+            return Err(USimpleError::new(
+                1,
+                format!("invalid date format {}", s.quote()),
+            ))
+        }
     };
 
     let tm = time::strptime(&ts, format)
-        .map_err(|_| USimpleError::new(1, format!("invalid date format '{}'", s)))?;
+        .map_err(|_| USimpleError::new(1, format!("invalid date format {}", s.quote())))?;
 
     let mut local = to_local(tm);
     local.tm_isdst = -1;
@@ -269,7 +276,10 @@ fn parse_timestamp(s: &str) -> UResult<FileTime> {
     };
     let tm2 = time::at(ts);
     if tm.tm_hour != tm2.tm_hour {
-        return Err(USimpleError::new(1, format!("invalid date format '{}'", s)));
+        return Err(USimpleError::new(
+            1,
+            format!("invalid date format {}", s.quote()),
+        ));
     }
 
     Ok(ft)

src/uu/tr/src/tr.rs

@@ -21,7 +21,7 @@ use fnv::FnvHashMap;
 use std::io::{stdin, stdout, BufRead, BufWriter, Write};
 
 use crate::expand::ExpandSet;
-use uucore::InvalidEncodingHandling;
+use uucore::{display::Quotable, InvalidEncodingHandling};
 
 static ABOUT: &str = "translate or delete characters";
 
@@ -271,8 +271,8 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
 
     if !(delete_flag || squeeze_flag) && sets.len() < 2 {
         show_error!(
-            "missing operand after '{}'\nTry '{} --help' for more information.",
-            sets[0],
+            "missing operand after {}\nTry '{} --help' for more information.",
+            sets[0].quote(),
             uucore::execution_phrase()
         );
         return 1;

src/uu/truncate/src/truncate.rs

@@ -15,6 +15,7 @@ use std::convert::TryFrom;
 use std::fs::{metadata, OpenOptions};
 use std::io::ErrorKind;
 use std::path::Path;
+use uucore::display::Quotable;
 use uucore::parse_size::{parse_size, ParseSizeError};
 
 #[derive(Debug, Eq, PartialEq)]
@@ -120,8 +121,8 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                     let reference = matches.value_of(options::REFERENCE).map(String::from);
                     crash!(
                         1,
-                        "cannot stat '{}': No such file or directory",
-                        reference.unwrap_or_else(|| "".to_string())
+                        "cannot stat {}: No such file or directory",
+                        reference.as_deref().unwrap_or("").quote()
                     ); // TODO: fix '--no-create' see test_reference and test_truncate_bytes_size
                 }
                 _ => crash!(1, "{}", e.to_string()),

src/uu/tsort/src/tsort.rs

@@ -14,6 +14,7 @@ use std::collections::{HashMap, HashSet};
 use std::fs::File;
 use std::io::{stdin, BufRead, BufReader, Read};
 use std::path::Path;
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 static SUMMARY: &str = "Topological sort the strings in FILE.
@@ -45,7 +46,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         file_buf = match File::open(Path::new(&input)) {
             Ok(a) => a,
             _ => {
-                show_error!("{}: No such file or directory", input);
+                show_error!("{}: No such file or directory", input.maybe_quote());
                 return 1;
             }
         };
@@ -68,7 +69,11 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
                 for ab in tokens.chunks(2) {
                     match ab.len() {
                         2 => g.add_edge(&ab[0], &ab[1]),
-                        _ => crash!(1, "{}: input contains an odd number of tokens", input),
+                        _ => crash!(
+                            1,
+                            "{}: input contains an odd number of tokens",
+                            input.maybe_quote()
+                        ),
                     }
                 }
             }

src/uu/unexpand/src/unexpand.rs

@@ -16,6 +16,7 @@ use std::fs::File;
 use std::io::{stdin, stdout, BufRead, BufReader, BufWriter, Read, Stdout, Write};
 use std::str::from_utf8;
 use unicode_width::UnicodeWidthChar;
+use uucore::display::Quotable;
 use uucore::InvalidEncodingHandling;
 
 static NAME: &str = "unexpand";
@@ -141,9 +142,9 @@ fn open(path: String) -> BufReader<Box<dyn Read + 'static>> {
     if path == "-" {
         BufReader::new(Box::new(stdin()) as Box<dyn Read>)
     } else {
-        file_buf = match File::open(&path[..]) {
+        file_buf = match File::open(&path) {
             Ok(a) => a,
-            Err(e) => crash!(1, "{}: {}", &path[..], e),
+            Err(e) => crash!(1, "{}: {}", path.maybe_quote(), e),
         };
         BufReader::new(Box::new(file_buf) as Box<dyn Read>)
     }

src/uu/uniq/src/uniq.rs

@@ -14,6 +14,7 @@ use std::io::{stdin, stdout, BufRead, BufReader, BufWriter, Read, Result, Write}
 use std::path::Path;
 use std::str::FromStr;
 use strum_macros::{AsRefStr, EnumString};
+use uucore::display::Quotable;
 
 static ABOUT: &str = "Report or omit repeated lines.";
 pub mod options {
@@ -217,7 +218,14 @@ fn get_line_string(io_line: Result<Vec<u8>>) -> String {
 fn opt_parsed<T: FromStr>(opt_name: &str, matches: &ArgMatches) -> Option<T> {
     matches.value_of(opt_name).map(|arg_str| {
         let opt_val: Option<T> = arg_str.parse().ok();
-        opt_val.unwrap_or_else(|| crash!(1, "Invalid argument for {}: {}", opt_name, arg_str))
+        opt_val.unwrap_or_else(|| {
+            crash!(
+                1,
+                "Invalid argument for {}: {}",
+                opt_name,
+                arg_str.maybe_quote()
+            )
+        })
     })
 }
 

src/uu/unlink/Cargo.toml

@@ -16,7 +16,6 @@ path = "src/unlink.rs"
 
 [dependencies]
 clap = { version = "2.33", features = ["wrap_help"] }
-libc = "0.2.42"
 uucore = { version=">=0.0.9", package="uucore", path="../../uucore" }
 uucore_procs = { version=">=0.0.6", package="uucore_procs", path="../../uucore_procs" }
 

src/uu/unlink/src/unlink.rs

@@ -7,96 +7,32 @@
 
 /* last synced with: unlink (GNU coreutils) 8.21 */
 
-// spell-checker:ignore (ToDO) lstat IFLNK IFMT IFREG
-
 #[macro_use]
 extern crate uucore;
 
-use clap::{crate_version, App, Arg};
-use libc::{lstat, stat, unlink};
-use libc::{S_IFLNK, S_IFMT, S_IFREG};
-use std::ffi::CString;
-use std::io::{Error, ErrorKind};
-use uucore::InvalidEncodingHandling;
+use std::fs::remove_file;
+use std::path::Path;
 
-static ABOUT: &str = "Unlink the file at [FILE].";
+use clap::{crate_version, App, Arg};
+
+use uucore::display::Quotable;
+use uucore::error::{FromIo, UResult};
+
+static ABOUT: &str = "Unlink the file at FILE.";
 static OPT_PATH: &str = "FILE";
 
-fn usage() -> String {
-    format!("{} [OPTION]... FILE", uucore::execution_phrase())
-}
+#[uucore_procs::gen_uumain]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
+    let matches = uu_app().get_matches_from(args);
 
-pub fn uumain(args: impl uucore::Args) -> i32 {
-    let args = args
-        .collect_str(InvalidEncodingHandling::ConvertLossy)
-        .accept_any();
+    let path: &Path = matches.value_of_os(OPT_PATH).unwrap().as_ref();
 
-    let usage = usage();
-
-    let matches = uu_app().usage(&usage[..]).get_matches_from(args);
-
-    let paths: Vec<String> = matches
-        .values_of(OPT_PATH)
-        .map(|v| v.map(ToString::to_string).collect())
-        .unwrap_or_default();
-
-    if paths.is_empty() {
-        crash!(
-            1,
-            "missing operand\nTry '{0} --help' for more information.",
-            uucore::execution_phrase()
-        );
-    } else if paths.len() > 1 {
-        crash!(
-            1,
-            "extra operand: '{1}'\nTry '{0} --help' for more information.",
-            uucore::execution_phrase(),
-            paths[1]
-        );
-    }
-
-    let c_string = CString::new(paths[0].clone()).unwrap(); // unwrap() cannot fail, the string comes from argv so it cannot contain a \0.
-
-    let st_mode = {
-        #[allow(deprecated)]
-        let mut buf: stat = unsafe { std::mem::uninitialized() };
-        let result = unsafe { lstat(c_string.as_ptr(), &mut buf as *mut stat) };
-
-        if result < 0 {
-            crash!(1, "Cannot stat '{}': {}", paths[0], Error::last_os_error());
-        }
-
-        buf.st_mode & S_IFMT
-    };
-
-    let result = if st_mode != S_IFREG && st_mode != S_IFLNK {
-        Err(Error::new(
-            ErrorKind::Other,
-            "Not a regular file or symlink",
-        ))
-    } else {
-        let result = unsafe { unlink(c_string.as_ptr()) };
-
-        if result < 0 {
-            Err(Error::last_os_error())
-        } else {
-            Ok(())
-        }
-    };
-
-    match result {
-        Ok(_) => (),
-        Err(e) => {
-            crash!(1, "cannot unlink '{0}': {1}", paths[0], e);
-        }
-    }
-
-    0
+    remove_file(path).map_err_context(|| format!("cannot unlink {}", path.quote()))
 }
 
 pub fn uu_app() -> App<'static, 'static> {
     App::new(uucore::util_name())
         .version(crate_version!())
         .about(ABOUT)
-        .arg(Arg::with_name(OPT_PATH).hidden(true).multiple(true))
+        .arg(Arg::with_name(OPT_PATH).required(true).hidden(true))
 }

src/uu/uptime/src/uptime.rs

@@ -17,6 +17,8 @@ extern crate uucore;
 pub use uucore::libc;
 use uucore::libc::time_t;
 
+use uucore::error::{UResult, USimpleError};
+
 static ABOUT: &str = "Display the current time, the length of time the system has been up,\n\
                       the number of users on the system, and the average number of jobs\n\
                       in the run queue over the last 1, 5 and 15 minutes.";
@@ -36,21 +38,20 @@ fn usage() -> String {
     format!("{0} [OPTION]...", uucore::execution_phrase())
 }
 
-pub fn uumain(args: impl uucore::Args) -> i32 {
+#[uucore_procs::gen_uumain]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let usage = usage();
     let matches = uu_app().usage(&usage[..]).get_matches_from(args);
 
     let (boot_time, user_count) = process_utmpx();
     let uptime = get_uptime(boot_time);
     if uptime < 0 {
-        show_error!("could not retrieve system uptime");
-
-        1
+        Err(USimpleError::new(1, "could not retrieve system uptime"))
     } else {
         if matches.is_present(options::SINCE) {
             let initial_date = Local.timestamp(Utc::now().timestamp() - uptime, 0);
             println!("{}", initial_date.format("%Y-%m-%d %H:%M:%S"));
-            return 0;
+            return Ok(());
         }
 
         print_time();
@@ -59,7 +60,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         print_nusers(user_count);
         print_loadavg();
 
-        0
+        Ok(())
     }
 }
 

src/uu/wc/Cargo.toml

@@ -16,7 +16,7 @@ path = "src/wc.rs"
 
 [dependencies]
 clap = { version = "2.33", features = ["wrap_help"] }
-uucore = { version=">=0.0.9", package="uucore", path="../../uucore" }
+uucore = { version=">=0.0.9", package="uucore", path="../../uucore", features=["pipes"] }
 uucore_procs = { version=">=0.0.6", package="uucore_procs", path="../../uucore_procs" }
 bytecount = "0.6.2"
 utf-8 = "0.7.6"

src/uu/wc/src/count_fast.rs

@@ -3,7 +3,7 @@ use crate::word_count::WordCount;
 use super::WordCountable;
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
-use std::fs::{File, OpenOptions};
+use std::fs::OpenOptions;
 use std::io::{self, ErrorKind, Read};
 
 #[cfg(unix)]
@@ -11,34 +11,17 @@ use libc::S_IFREG;
 #[cfg(unix)]
 use nix::sys::stat;
 #[cfg(any(target_os = "linux", target_os = "android"))]
-use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
+use std::os::unix::io::AsRawFd;
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
 use libc::S_IFIFO;
 #[cfg(any(target_os = "linux", target_os = "android"))]
-use nix::fcntl::{splice, SpliceFFlags};
-#[cfg(any(target_os = "linux", target_os = "android"))]
-use nix::unistd::pipe;
+use uucore::pipes::{pipe, splice, splice_exact};
 
 const BUF_SIZE: usize = 16 * 1024;
 #[cfg(any(target_os = "linux", target_os = "android"))]
 const SPLICE_SIZE: usize = 128 * 1024;
 
-/// Splice wrapper which handles short writes
-#[cfg(any(target_os = "linux", target_os = "android"))]
-#[inline]
-fn splice_exact(read_fd: RawFd, write_fd: RawFd, num_bytes: usize) -> nix::Result<()> {
-    let mut left = num_bytes;
-    loop {
-        let written = splice(read_fd, None, write_fd, None, left, SpliceFFlags::empty())?;
-        left -= written;
-        if left == 0 {
-            break;
-        }
-    }
-    Ok(())
-}
-
 /// This is a Linux-specific function to count the number of bytes using the
 /// `splice` system call, which is faster than using `read`.
 ///
@@ -46,13 +29,14 @@ fn splice_exact(read_fd: RawFd, write_fd: RawFd, num_bytes: usize) -> nix::Resul
 /// caller will fall back to a simpler method.
 #[inline]
 #[cfg(any(target_os = "linux", target_os = "android"))]
-fn count_bytes_using_splice(fd: RawFd) -> Result<usize, usize> {
+fn count_bytes_using_splice(fd: &impl AsRawFd) -> Result<usize, usize> {
     let null_file = OpenOptions::new()
         .write(true)
         .open("/dev/null")
         .map_err(|_| 0_usize)?;
-    let null = null_file.as_raw_fd();
-    let null_rdev = stat::fstat(null).map_err(|_| 0_usize)?.st_rdev;
+    let null_rdev = stat::fstat(null_file.as_raw_fd())
+        .map_err(|_| 0_usize)?
+        .st_rdev;
     if (stat::major(null_rdev), stat::minor(null_rdev)) != (1, 3) {
         // This is not a proper /dev/null, writing to it is probably bad
         // Bit of an edge case, but it has been known to happen
@@ -60,17 +44,13 @@ fn count_bytes_using_splice(fd: RawFd) -> Result<usize, usize> {
     }
     let (pipe_rd, pipe_wr) = pipe().map_err(|_| 0_usize)?;
 
-    // Ensure the pipe is closed when the function returns.
-    // SAFETY: The file descriptors do not have other owners.
-    let _handles = unsafe { (File::from_raw_fd(pipe_rd), File::from_raw_fd(pipe_wr)) };
-
     let mut byte_count = 0;
     loop {
-        match splice(fd, None, pipe_wr, None, SPLICE_SIZE, SpliceFFlags::empty()) {
+        match splice(fd, &pipe_wr, SPLICE_SIZE) {
             Ok(0) => break,
             Ok(res) => {
                 byte_count += res;
-                if splice_exact(pipe_rd, null, res).is_err() {
+                if splice_exact(&pipe_rd, &null_file, res).is_err() {
                     return Err(byte_count);
                 }
             }
@@ -106,7 +86,7 @@ pub(crate) fn count_bytes_fast<T: WordCountable>(handle: &mut T) -> (usize, Opti
                 // Else, if we're on Linux and our file is a FIFO pipe
                 // (or stdin), we use splice to count the number of bytes.
                 if (stat.st_mode & S_IFIFO) != 0 {
-                    match count_bytes_using_splice(fd) {
+                    match count_bytes_using_splice(handle) {
                         Ok(n) => return (n, None),
                         Err(n) => byte_count = n,
                     }

src/uu/wc/src/wc.rs

@@ -424,8 +424,15 @@ fn wc(inputs: Vec<Input>, settings: &Settings) -> Result<(), u32> {
     // The width is the number of digits needed to print the number of
     // bytes in the largest file. This is true regardless of whether
     // the `settings` indicate that the bytes will be displayed.
+    //
+    // If we only need to display a single number, set this to 0 to
+    // prevent leading spaces.
     let mut failure = false;
-    let max_width = max_width(&inputs);
+    let max_width = if settings.number_enabled() <= 1 {
+        0
+    } else {
+        max_width(&inputs)
+    };
 
     let mut total_word_count = WordCount::default();
 
@@ -475,20 +482,10 @@ fn wc(inputs: Vec<Input>, settings: &Settings) -> Result<(), u32> {
     }
 }
 
-fn print_stats(
-    settings: &Settings,
-    result: &TitledWordCount,
-    mut min_width: usize,
-) -> io::Result<()> {
+fn print_stats(settings: &Settings, result: &TitledWordCount, min_width: usize) -> io::Result<()> {
     let stdout = io::stdout();
     let mut stdout_lock = stdout.lock();
 
-    if settings.number_enabled() <= 1 {
-        // Prevent a leading space in case we only need to display a single
-        // number.
-        min_width = 0;
-    }
-
     let mut is_first: bool = true;
 
     if settings.show_lines {

src/uu/yes/Cargo.toml

@@ -16,7 +16,7 @@ path = "src/yes.rs"
 
 [dependencies]
 clap = { version = "2.33", features = ["wrap_help"] }
-uucore = { version=">=0.0.9", package="uucore", path="../../uucore" }
+uucore = { version=">=0.0.9", package="uucore", path="../../uucore", features=["pipes"] }
 uucore_procs = { version=">=0.0.6", package="uucore_procs", path="../../uucore_procs" }
 
 [target.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]

src/uu/yes/src/splice.rs

@@ -16,18 +16,11 @@
 //! make any effort to rescue data from the pipe if splice() fails, we can
 //! just fall back and start over from the beginning.
 
-use std::{
-    fs::File,
-    io,
-    os::unix::io::{AsRawFd, FromRawFd},
-};
+use std::{io, os::unix::io::AsRawFd};
 
-use nix::{
-    errno::Errno,
-    fcntl::SpliceFFlags,
-    libc::S_IFIFO,
-    sys::{stat::fstat, uio::IoVec},
-};
+use nix::{errno::Errno, libc::S_IFIFO, sys::stat::fstat};
+
+use uucore::pipes::{pipe, splice_exact, vmsplice};
 
 pub(crate) fn splice_data(bytes: &[u8], out: &impl AsRawFd) -> Result<()> {
     let is_pipe = fstat(out.as_raw_fd())?.st_mode & S_IFIFO != 0;
@@ -36,7 +29,7 @@ pub(crate) fn splice_data(bytes: &[u8], out: &impl AsRawFd) -> Result<()> {
         loop {
             let mut bytes = bytes;
             while !bytes.is_empty() {
-                let len = vmsplice(out, bytes)?;
+                let len = vmsplice(out, bytes).map_err(maybe_unsupported)?;
                 bytes = &bytes[len..];
             }
         }
@@ -45,14 +38,8 @@ pub(crate) fn splice_data(bytes: &[u8], out: &impl AsRawFd) -> Result<()> {
         loop {
             let mut bytes = bytes;
             while !bytes.is_empty() {
-                let len = vmsplice(&write, bytes)?;
-                let mut remaining = len;
-                while remaining > 0 {
-                    match splice(&read, out, remaining)? {
-                        0 => panic!("Unexpected end of pipe"),
-                        n => remaining -= n,
-                    };
-                }
+                let len = vmsplice(&write, bytes).map_err(maybe_unsupported)?;
+                splice_exact(&read, out, len).map_err(maybe_unsupported)?;
                 bytes = &bytes[len..];
             }
         }
@@ -81,30 +68,3 @@ fn maybe_unsupported(error: nix::Error) -> Error {
         _ => error.into(),
     }
 }
-
-fn splice(source: &impl AsRawFd, target: &impl AsRawFd, len: usize) -> Result<usize> {
-    nix::fcntl::splice(
-        source.as_raw_fd(),
-        None,
-        target.as_raw_fd(),
-        None,
-        len,
-        SpliceFFlags::empty(),
-    )
-    .map_err(maybe_unsupported)
-}
-
-fn vmsplice(target: &impl AsRawFd, bytes: &[u8]) -> Result<usize> {
-    nix::fcntl::vmsplice(
-        target.as_raw_fd(),
-        &[IoVec::from_slice(bytes)],
-        SpliceFFlags::empty(),
-    )
-    .map_err(maybe_unsupported)
-}
-
-fn pipe() -> nix::Result<(File, File)> {
-    let (read, write) = nix::unistd::pipe()?;
-    // SAFETY: The file descriptors do not have other owners.
-    unsafe { Ok((File::from_raw_fd(read), File::from_raw_fd(write))) }
-}

src/uucore/Cargo.toml

@@ -30,6 +30,8 @@ data-encoding = { version="2.1", optional=true }
 data-encoding-macro = { version="0.1.12", optional=true }
 z85 = { version="3.0.3", optional=true }
 libc = { version="0.2.15", optional=true }
+once_cell = "1.8.0"
+nix = { version="0.20", optional=true }
 
 [dev-dependencies]
 clap = "2.33.3"
@@ -56,3 +58,4 @@ signals = []
 utf8 = []
 utmpx = ["time", "libc", "dns-lookup"]
 wide = []
+pipes = ["nix"]

src/uucore/src/lib/features.rs

@@ -19,6 +19,8 @@ pub mod mode;
 pub mod entries;
 #[cfg(all(unix, feature = "perms"))]
 pub mod perms;
+#[cfg(all(unix, feature = "pipes"))]
+pub mod pipes;
 #[cfg(all(unix, feature = "process"))]
 pub mod process;
 

src/uucore/src/lib/features/perms.rs

@@ -5,6 +5,7 @@
 
 //! Common functions to manage permissions
 
+use crate::display::Quotable;
 use crate::error::strip_errno;
 use crate::error::UResult;
 use crate::error::USimpleError;
@@ -80,29 +81,29 @@ pub fn wrap_chown<P: AsRef<Path>>(
             VerbosityLevel::Silent => (),
             level => {
                 out = format!(
-                    "changing {} of '{}': {}",
+                    "changing {} of {}: {}",
                     if verbosity.groups_only {
                         "group"
                     } else {
                         "ownership"
                     },
-                    path.display(),
+                    path.quote(),
                     e
                 );
                 if level == VerbosityLevel::Verbose {
                     out = if verbosity.groups_only {
                         format!(
-                            "{}\nfailed to change group of '{}' from {} to {}",
+                            "{}\nfailed to change group of {} from {} to {}",
                             out,
-                            path.display(),
+                            path.quote(),
                             entries::gid2grp(meta.gid()).unwrap(),
                             entries::gid2grp(dest_gid).unwrap()
                         )
                     } else {
                         format!(
-                            "{}\nfailed to change ownership of '{}' from {}:{} to {}:{}",
+                            "{}\nfailed to change ownership of {} from {}:{} to {}:{}",
                             out,
-                            path.display(),
+                            path.quote(),
                             entries::uid2usr(meta.uid()).unwrap(),
                             entries::gid2grp(meta.gid()).unwrap(),
                             entries::uid2usr(dest_uid).unwrap(),
@@ -120,15 +121,15 @@ pub fn wrap_chown<P: AsRef<Path>>(
                 VerbosityLevel::Changes | VerbosityLevel::Verbose => {
                     out = if verbosity.groups_only {
                         format!(
-                            "changed group of '{}' from {} to {}",
-                            path.display(),
+                            "changed group of {} from {} to {}",
+                            path.quote(),
                             entries::gid2grp(meta.gid()).unwrap(),
                             entries::gid2grp(dest_gid).unwrap()
                         )
                     } else {
                         format!(
-                            "changed ownership of '{}' from {}:{} to {}:{}",
-                            path.display(),
+                            "changed ownership of {} from {}:{} to {}:{}",
+                            path.quote(),
                             entries::uid2usr(meta.uid()).unwrap(),
                             entries::gid2grp(meta.gid()).unwrap(),
                             entries::uid2usr(dest_uid).unwrap(),
@@ -141,14 +142,14 @@ pub fn wrap_chown<P: AsRef<Path>>(
         } else if verbosity.level == VerbosityLevel::Verbose {
             out = if verbosity.groups_only {
                 format!(
-                    "group of '{}' retained as {}",
-                    path.display(),
+                    "group of {} retained as {}",
+                    path.quote(),
                     entries::gid2grp(dest_gid).unwrap_or_default()
                 )
             } else {
                 format!(
-                    "ownership of '{}' retained as {}:{}",
-                    path.display(),
+                    "ownership of {} retained as {}:{}",
+                    path.quote(),
                     entries::uid2usr(dest_uid).unwrap(),
                     entries::gid2grp(dest_gid).unwrap()
                 )
@@ -358,9 +359,9 @@ impl ChownExecutor {
                 match self.verbosity.level {
                     VerbosityLevel::Silent => (),
                     _ => show_error!(
-                        "cannot {} '{}': {}",
+                        "cannot {} {}: {}",
                         if follow { "dereference" } else { "access" },
-                        path.display(),
+                        path.quote(),
                         strip_errno(&e)
                     ),
                 }

src/uucore/src/lib/features/pipes.rs

@@ -0,0 +1,69 @@
+/// Thin pipe-related wrappers around functions from the `nix` crate.
+use std::fs::File;
+#[cfg(any(target_os = "linux", target_os = "android"))]
+use std::os::unix::io::AsRawFd;
+use std::os::unix::io::FromRawFd;
+
+#[cfg(any(target_os = "linux", target_os = "android"))]
+use nix::{fcntl::SpliceFFlags, sys::uio::IoVec};
+
+pub use nix::{Error, Result};
+
+/// A wrapper around [`nix::unistd::Pipe`] that ensures the pipe is cleaned up.
+///
+/// Returns two `File` objects: everything written to the second can be read
+/// from the first.
+pub fn pipe() -> Result<(File, File)> {
+    let (read, write) = nix::unistd::pipe()?;
+    // SAFETY: The file descriptors do not have other owners.
+    unsafe { Ok((File::from_raw_fd(read), File::from_raw_fd(write))) }
+}
+
+/// Less noisy wrapper around [`nix::fcntl::splice`].
+///
+/// Up to `len` bytes are moved from `source` to `target`. Returns the number
+/// of successfully moved bytes.
+///
+/// At least one of `source` and `target` must be some sort of pipe.
+/// To get around this requirement, consider splicing from your source into
+/// a [`pipe`] and then from the pipe into your target (with `splice_exact`):
+/// this is still very efficient.
+#[cfg(any(target_os = "linux", target_os = "android"))]
+pub fn splice(source: &impl AsRawFd, target: &impl AsRawFd, len: usize) -> Result<usize> {
+    nix::fcntl::splice(
+        source.as_raw_fd(),
+        None,
+        target.as_raw_fd(),
+        None,
+        len,
+        SpliceFFlags::empty(),
+    )
+}
+
+/// Splice wrapper which fully finishes the write.
+///
+/// Exactly `len` bytes are moved from `source` into `target`.
+///
+/// Panics if `source` runs out of data before `len` bytes have been moved.
+#[cfg(any(target_os = "linux", target_os = "android"))]
+pub fn splice_exact(source: &impl AsRawFd, target: &impl AsRawFd, len: usize) -> Result<()> {
+    let mut left = len;
+    while left != 0 {
+        let written = splice(source, target, left)?;
+        assert_ne!(written, 0, "unexpected end of data");
+        left -= written;
+    }
+    Ok(())
+}
+
+/// Copy data from `bytes` into `target`, which must be a pipe.
+///
+/// Returns the number of successfully copied bytes.
+#[cfg(any(target_os = "linux", target_os = "android"))]
+pub fn vmsplice(target: &impl AsRawFd, bytes: &[u8]) -> Result<usize> {
+    nix::fcntl::vmsplice(
+        target.as_raw_fd(),
+        &[IoVec::from_slice(bytes)],
+        SpliceFFlags::empty(),
+    )
+}

src/uucore/src/lib/lib.rs

@@ -49,6 +49,8 @@ pub use crate::features::mode;
 pub use crate::features::entries;
 #[cfg(all(unix, feature = "perms"))]
 pub use crate::features::perms;
+#[cfg(all(unix, feature = "pipes"))]
+pub use crate::features::pipes;
 #[cfg(all(unix, feature = "process"))]
 pub use crate::features::process;
 #[cfg(all(unix, not(target_os = "fuchsia"), feature = "signals"))]
@@ -70,6 +72,10 @@ pub use crate::features::wide;
 use std::ffi::OsString;
 use std::sync::atomic::Ordering;
 
+use once_cell::sync::Lazy;
+
+use crate::display::Quotable;
+
 pub fn get_utility_is_second_arg() -> bool {
     crate::macros::UTILITY_IS_SECOND_ARG.load(Ordering::SeqCst)
 }
@@ -78,36 +84,40 @@ pub fn set_utility_is_second_arg() {
     crate::macros::UTILITY_IS_SECOND_ARG.store(true, Ordering::SeqCst)
 }
 
-/// Get the executable path (as `OsString`).
-fn executable_os() -> OsString {
-    args_os().next().unwrap()
-}
+// args_os() can be expensive to call, it copies all of argv before iterating.
+// So if we want only the first arg or so it's overkill. We cache it.
+static ARGV: Lazy<Vec<OsString>> = Lazy::new(|| wild::args_os().collect());
 
-/// Get the executable path (as `String`).
-fn executable() -> String {
-    executable_os().to_string_lossy().into_owned()
-}
+static UTIL_NAME: Lazy<String> = Lazy::new(|| {
+    if get_utility_is_second_arg() {
+        &ARGV[1]
+    } else {
+        &ARGV[0]
+    }
+    .to_string_lossy()
+    .into_owned()
+});
 
 /// Derive the utility name.
-pub fn util_name() -> String {
-    if get_utility_is_second_arg() {
-        args_os().nth(1).unwrap().to_string_lossy().into_owned()
-    } else {
-        executable()
-    }
+pub fn util_name() -> &'static str {
+    &UTIL_NAME
 }
 
-/// Derive the complete execution phrase for "usage".
-pub fn execution_phrase() -> String {
+static EXECUTION_PHRASE: Lazy<String> = Lazy::new(|| {
     if get_utility_is_second_arg() {
-        args_os()
+        ARGV.iter()
             .take(2)
             .map(|os_str| os_str.to_string_lossy().into_owned())
             .collect::<Vec<_>>()
             .join(" ")
     } else {
-        executable()
+        ARGV[0].to_string_lossy().into_owned()
     }
+});
+
+/// Derive the complete execution phrase for "usage".
+pub fn execution_phrase() -> &'static str {
+    &EXECUTION_PHRASE
 }
 
 pub enum InvalidEncodingHandling {
@@ -165,14 +175,15 @@ pub trait Args: Iterator<Item = OsString> + Sized {
                 Ok(string) => Ok(string),
                 Err(s_ret) => {
                     full_conversion = false;
-                    let lossy_conversion = s_ret.to_string_lossy();
                     eprintln!(
-                        "Input with broken encoding occurred! (s = '{}') ",
-                        &lossy_conversion
+                        "Input with broken encoding occurred! (s = {}) ",
+                        s_ret.quote()
                     );
                     match handling {
                         InvalidEncodingHandling::Ignore => Err(String::new()),
-                        InvalidEncodingHandling::ConvertLossy => Err(lossy_conversion.to_string()),
+                        InvalidEncodingHandling::ConvertLossy => {
+                            Err(s_ret.to_string_lossy().into_owned())
+                        }
                         InvalidEncodingHandling::Panic => {
                             panic!("Broken encoding found but caller cannot handle it")
                         }
@@ -204,13 +215,8 @@ pub trait Args: Iterator<Item = OsString> + Sized {
 
 impl<T: Iterator<Item = OsString> + Sized> Args for T {}
 
-// args() ...
-pub fn args() -> impl Iterator<Item = String> {
-    wild::args()
-}
-
 pub fn args_os() -> impl Iterator<Item = OsString> {
-    wild::args_os()
+    ARGV.iter().cloned()
 }
 
 #[cfg(test)]

src/uucore/src/lib/mods/backup_control.rs

@@ -78,7 +78,10 @@
 
 // spell-checker:ignore backupopt
 
-use crate::error::{UError, UResult};
+use crate::{
+    display::Quotable,
+    error::{UError, UResult},
+};
 use clap::ArgMatches;
 use std::{
     env,
@@ -167,18 +170,22 @@ impl Display for BackupError {
         match self {
             BE::InvalidArgument(arg, origin) => write!(
                 f,
-                "invalid argument '{}' for '{}'\n{}",
-                arg, origin, VALID_ARGS_HELP
+                "invalid argument {} for '{}'\n{}",
+                arg.quote(),
+                origin,
+                VALID_ARGS_HELP
             ),
             BE::AmbiguousArgument(arg, origin) => write!(
                 f,
-                "ambiguous argument '{}' for '{}'\n{}",
-                arg, origin, VALID_ARGS_HELP
+                "ambiguous argument {} for '{}'\n{}",
+                arg.quote(),
+                origin,
+                VALID_ARGS_HELP
             ),
             BE::BackupImpossible() => write!(f, "cannot create backup"),
             // Placeholder for later
             // BE::BackupFailed(from, to, e) => Display::fmt(
-            //     &uio_error!(e, "failed to backup '{}' to '{}'", from.display(), to.display()),
+            //     &uio_error!(e, "failed to backup {} to {}", from.quote(), to.quote()),
             //     f
             // ),
         }

src/uucore/src/lib/mods/display.rs

@@ -87,13 +87,16 @@ macro_rules! impl_as_ref {
     };
 }
 
+impl_as_ref!(str);
 impl_as_ref!(&'_ str);
 impl_as_ref!(String);
+impl_as_ref!(std::path::Path);
 impl_as_ref!(&'_ std::path::Path);
 impl_as_ref!(std::path::PathBuf);
 impl_as_ref!(std::path::Component<'_>);
 impl_as_ref!(std::path::Components<'_>);
 impl_as_ref!(std::path::Iter<'_>);
+impl_as_ref!(std::ffi::OsStr);
 impl_as_ref!(&'_ std::ffi::OsStr);
 impl_as_ref!(std::ffi::OsString);
 
@@ -106,6 +109,13 @@ impl Quotable for Cow<'_, str> {
     }
 }
 
+impl Quotable for Cow<'_, std::path::Path> {
+    fn quote(&self) -> Quoted<'_> {
+        let text: &std::path::Path = self.as_ref();
+        Quoted::new(text.as_ref())
+    }
+}
+
 /// A wrapper around [`OsStr`] for printing paths with quoting and escaping applied.
 #[derive(Debug, Copy, Clone)]
 pub struct Quoted<'a> {
@@ -407,6 +417,19 @@ pub fn println_verbatim<S: AsRef<OsStr>>(text: S) -> io::Result<()> {
     Ok(())
 }
 
+/// Like `println_verbatim`, without the trailing newline.
+pub fn print_verbatim<S: AsRef<OsStr>>(text: S) -> io::Result<()> {
+    let mut stdout = io::stdout();
+    #[cfg(any(unix, target_os = "wasi"))]
+    {
+        stdout.write_all(text.as_ref().as_bytes())
+    }
+    #[cfg(not(any(unix, target_os = "wasi")))]
+    {
+        write!(stdout, "{}", std::path::Path::new(text.as_ref()).display())
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;