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304f52ad1b
Event: Advance UNIX programming course (Fall'23) at NTHU Pull Request: https://github.com/freebsd/freebsd-src/pull/1027
306 lines
8.6 KiB
Groff
306 lines
8.6 KiB
Groff
.\"-
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.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd March 29, 2023
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.Dt DF 1
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.Os
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.Sh NAME
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.Nm df
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.Nd display free disk space
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.Sh SYNOPSIS
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.Nm
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.Op Fl -libxo
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.Op Fl b | g | H | h | k | m | P
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.Op Fl acilnT
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.Op Fl \&,
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.Op Fl t Ar type
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.Op Ar file | filesystem ...
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.Sh DESCRIPTION
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The
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.Nm
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utility
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displays statistics about the amount of free disk space on the specified
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mounted
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.Ar file system
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or on the file system of which
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.Ar file
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is a part.
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By default block counts are displayed with an assumed block size of
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512 bytes.
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If neither a file or a file system operand is specified,
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statistics for all mounted file systems are displayed
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(subject to the
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.Fl t
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option below).
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl -libxo
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Generate output via
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.Xr libxo 3
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in a selection of different human and machine readable formats.
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See
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.Xr xo_parse_args 3
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for details on command line arguments.
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.It Fl a
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Show all mount points, including those that were mounted with the
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.Dv MNT_IGNORE
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flag.
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This is implied for file systems specified on the command line.
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.It Fl b
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Explicitly use 512 byte blocks, overriding any
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.Ev BLOCKSIZE
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specification from the environment.
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This is the same as the
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.Fl P
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option.
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The
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.Fl k
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option overrides this option.
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.It Fl c
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Display a grand total.
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.It Fl g
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Use 1073741824 byte (1 Gibibyte) blocks rather than the default.
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This overrides any
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl h
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.Dq Human-readable
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output.
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Use unit suffixes: Byte, Kibibyte, Mebibyte, Gibibyte, Tebibyte and
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Pebibyte (based on powers of 1024) in order to reduce the number of
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digits to four or fewer.
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.It Fl H , Fl Fl si
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Same as
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.Fl h
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but based on powers of 1000.
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.It Fl i
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Include statistics on the number of free and used inodes.
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In conjunction with the
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.Fl h
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or
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.Fl H
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options, the number of inodes is scaled by powers of 1000.
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In case the filesystem has no inodes then
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.Sq -
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is displayed instead of the usage percentage.
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.It Fl k
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Use 1024 byte (1 Kibibyte) blocks rather than the default.
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This overrides the
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.Fl P
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option and any
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl l
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Select a locally-mounted file system for display.
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If used in combination with the
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.Fl t Ar type
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option, file system types will be added or excluded according to the
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parameters of that option.
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.It Fl m
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Use 1048576 byte (1 Mebibyte) blocks rather than the default.
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This overrides any
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.Ev BLOCKSIZE
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specification from the environment.
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.It Fl n
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Print out the previously obtained statistics from the file systems.
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This option should be used if it is possible that one or more
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file systems are in a state such that they will not be able to provide
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statistics without a long delay.
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When this option is specified,
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.Nm
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will not request new statistics from the file systems, but will respond
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with the possibly stale statistics that were previously obtained.
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.It Fl P
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Explicitly use 512 byte blocks, overriding any
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.Ev BLOCKSIZE
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specification from the environment.
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This is the same as the
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.Fl b
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option.
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The
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.Fl k
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option overrides this option.
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.It Fl t Ar type
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Select file systems to display.
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More than one type may be specified in a comma separated list.
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The list of file system types can be prefixed with
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.Dq no
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to specify the file system types for which action should
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.Em not
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be taken.
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If used in combination with the
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.Fl l
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option, the parameters of this option will modify the list of
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locally-mounted file systems selected by the
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.Fl l
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option.
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For example, the
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.Nm
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command:
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.Bd -literal -offset indent
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df -t nonfs,nullfs
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.Ed
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.Pp
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lists all file systems except those of type NFS and NULLFS.
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The
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.Xr lsvfs 1
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command can be used to find out the types of file systems
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that are available on the system.
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.It Fl T
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Include file system type.
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.It Fl ,
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(Comma) Print sizes grouped and separated by thousands using the
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non-monetary separator returned by
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.Xr localeconv 3 ,
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typically a comma or period.
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If no locale is set, or the locale does not have a non-monetary separator, this
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option has no effect.
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.El
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.Sh ENVIRONMENT
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.Bl -tag -width BLOCKSIZE
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.It Ev BLOCKSIZE
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Specifies the units in which to report block counts.
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This uses
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.Xr getbsize 3 ,
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which allows units of bytes or numbers scaled with the letters
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.Em k
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(for multiples of 1024 bytes),
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.Em m
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(for multiples of 1048576 bytes) or
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.Em g
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(for gibibytes).
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The allowed range is 512 bytes to 1 GB.
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If the value is outside, it will be set to the appropriate limit.
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.El
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.Sh EXAMPLES
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Show human readable free disk space for all mount points including file system
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type:
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.Bd -literal -offset indent
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$ df -ahT
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Filesystem Type Size Used Avail Capacity Mounted on
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/dev/ada1p2 ufs 213G 152G 44G 78% /
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devfs devfs 1.0K 1.0K 0B 100% /dev
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/dev/ada0p1 ufs 1.8T 168G 1.5T 10% /data
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linsysfs linsysfs 4.0K 4.0K 0B 100% /compat/linux/sys
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/dev/da0 msdosfs 7.6G 424M 7.2G 5% /mnt/usb
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.Ed
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.Pp
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Show previously collected data including inode statistics except for devfs or
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linsysfs file systems.
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Note that the
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.Dq no
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prefix affects all the file systems in the list and the
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.Fl t
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option can be specified only once:
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.Bd -literal -offset indent
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$ df -i -n -t nodevfs,linsysfs
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Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
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Mounted on
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/dev/ada1p2 223235736 159618992 45757888 78% 1657590 27234568 6% /
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/dev/ada0p1 1892163184 176319420 1564470712 10% 1319710 243300576 1%
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/data
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/dev/da0 7989888 433664 7556224 5% 0 0 100%
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/mnt/usb
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.Ed
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.Pp
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Show human readable information for the file system containing the file
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.Pa /etc/rc.conf :
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.Bd -literal -offset indent
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$ df -h /etc/rc.conf
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Filesystem Size Used Avail Capacity Mounted on
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/dev/ada1p2 213G 152G 44G 78% /
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.Ed
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.Pp
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Same as above but specifying some file system:
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.Bd -literal -offset indent
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$ df -h /dev/ada1p2
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Filesystem Size Used Avail Capacity Mounted on
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/dev/ada1p2 213G 152G 44G 78% /
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.Ed
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.Sh NOTES
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For non-Unix file systems, the reported values of used and free inodes
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may have a different meaning than that of used and available files and
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directories.
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An example is msdosfs, which in the case of FAT12 or FAT16 file systems
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reports the number of available and free root directory entries instead
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of inodes
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.Po
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where 1 to 21 such directory entries are required to store
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each file or directory name or disk label
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.Pc .
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.Sh SEE ALSO
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.Xr lsvfs 1 ,
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.Xr quota 1 ,
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.Xr fstatfs 2 ,
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.Xr getfsstat 2 ,
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.Xr statfs 2 ,
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.Xr getbsize 3 ,
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.Xr getmntinfo 3 ,
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.Xr libxo 3 ,
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.Xr localeconv 3 ,
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.Xr xo_parse_args 3 ,
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.Xr fstab 5 ,
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.Xr mount 8 ,
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.Xr pstat 8 ,
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.Xr quot 8 ,
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.Xr swapinfo 8
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.Sh STANDARDS
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With the exception of most options,
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the
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.Nm
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utility conforms to
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.St -p1003.1-2004 ,
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which defines only the
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.Fl k , P
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and
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.Fl t
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options.
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v1 .
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.Sh BUGS
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The
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.Fl n
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flag is ignored if a file or file system is specified.
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Also, if a mount
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point is not accessible by the user, it is possible that the file system
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information could be stale.
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.Pp
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The
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.Fl b
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and
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.Fl P
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options are identical.
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The former comes from the BSD tradition, and the latter is required
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for
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.St -p1003.1-2004
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conformity.
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