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11715600e6
Output a line as soon as it is possible to determine that it will have to be output. For the basic case, this means output each line as it is read unless it is identical to the previous one. For the -d case, it means output the first instance as soon as the second is read, unless the -c option was also given. The -D and -u cases were already fine. Add test cases for interactive use with no options and with -d. Explicitly ignore -d when -D is also specified. MFC after: 1 week Sponsored by: Klara, Inc. Reviewed by: rew, kevans Differential Revision: https://reviews.freebsd.org/D43382
219 lines
5.8 KiB
Groff
219 lines
5.8 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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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 January 12, 2024
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.Dt UNIQ 1
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.Os
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.Sh NAME
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.Nm uniq
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.Nd report or filter out repeated lines in a file
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.Sh SYNOPSIS
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.Nm
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.Op Fl c | Fl d | Fl D | Fl u
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.Op Fl i
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.Op Fl f Ar num
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.Op Fl s Ar chars
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.Oo
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.Ar input_file
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.Op Ar output_file
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.Oc
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.Sh DESCRIPTION
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The
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.Nm
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utility reads the specified
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.Ar input_file
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comparing adjacent lines, and writes a copy of each unique input line to
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the
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.Ar output_file .
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If
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.Ar input_file
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is a single dash
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.Pq Sq Fl
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or absent, the standard input is read.
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If
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.Ar output_file
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is absent, standard output is used for output.
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The second and succeeding copies of identical adjacent input lines are
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not written.
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Repeated lines in the input will not be detected if they are not adjacent,
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so it may be necessary to sort the files first.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl c , Fl -count
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Precede each output line with the count of the number of times the line
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occurred in the input, followed by a single space.
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.It Fl d , Fl -repeated
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Output a single copy of each line that is repeated in the input.
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Ignored if
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.Fl D
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is also specified.
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.It Fl D , Fl -all-repeated Op Ar septype
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Output all lines that are repeated (like
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.Fl d ,
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but each copy of the repeated line is written).
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The optional
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.Ar septype
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argument controls how to separate groups of repeated lines in the output;
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it must be one of the following values:
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.Pp
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.Bl -tag -compact -width separate
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.It none
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Do not separate groups of lines (this is the default).
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.It prepend
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Output an empty line before each group of lines.
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.It separate
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Output an empty line after each group of lines.
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.El
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.It Fl f Ar num , Fl -skip-fields Ar num
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Ignore the first
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.Ar num
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fields in each input line when doing comparisons.
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A field is a string of non-blank characters separated from adjacent fields
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by blanks.
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Field numbers are one based, i.e., the first field is field one.
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.It Fl i , Fl -ignore-case
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Case insensitive comparison of lines.
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.It Fl s Ar chars , Fl -skip-chars Ar chars
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Ignore the first
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.Ar chars
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characters in each input line when doing comparisons.
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If specified in conjunction with the
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.Fl f , Fl -unique
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option, the first
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.Ar chars
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characters after the first
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.Ar num
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fields will be ignored.
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Character numbers are one based, i.e., the first character is character one.
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.It Fl u , Fl -unique
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Only output lines that are not repeated in the input.
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.\".It Fl Ns Ar n
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.\"(Deprecated; replaced by
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.\".Fl f ) .
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.\"Ignore the first n
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.\"fields on each input line when doing comparisons,
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.\"where n is a number.
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.\"A field is a string of non-blank
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.\"characters separated from adjacent fields
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.\"by blanks.
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.\".It Cm \&\(pl Ns Ar n
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.\"(Deprecated; replaced by
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.\".Fl s ) .
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.\"Ignore the first
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.\".Ar m
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.\"characters when doing comparisons, where
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.\".Ar m
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.\"is a
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.\"number.
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.El
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.Sh ENVIRONMENT
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The
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.Ev LANG ,
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.Ev LC_ALL ,
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.Ev LC_COLLATE
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and
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.Ev LC_CTYPE
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environment variables affect the execution of
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.Nm
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as described in
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.Xr environ 7 .
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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Assuming a file named cities.txt with the following content:
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.Bd -literal -offset indent
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Madrid
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Lisbon
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Madrid
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.Ed
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.Pp
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The following command reports three different lines since identical elements
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are not adjacent:
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.Bd -literal -offset indent
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$ uniq -u cities.txt
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Madrid
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Lisbon
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Madrid
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.Ed
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.Pp
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Sort the file and count the number of identical lines:
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.Bd -literal -offset indent
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$ sort cities.txt | uniq -c
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1 Lisbon
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2 Madrid
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.Ed
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.Pp
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Assuming the following content for the file cities.txt:
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.Bd -literal -offset indent
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madrid
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Madrid
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Lisbon
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.Ed
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.Pp
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Show repeated lines ignoring case sensitiveness:
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.Bd -literal -offset indent
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$ uniq -d -i cities.txt
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madrid
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.Ed
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.Pp
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Same as above but showing the whole group of repeated lines:
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.Bd -literal -offset indent
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$ uniq -D -i cities.txt
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madrid
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Madrid
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.Ed
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.Pp
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Report the number of identical lines ignoring the first character of every line:
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.Bd -literal -offset indent
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$ uniq -s 1 -c cities.txt
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2 madrid
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1 Lisbon
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.Ed
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.Sh COMPATIBILITY
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The historic
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.Cm \&\(pl Ns Ar number
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and
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.Fl Ns Ar number
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options have been deprecated but are still supported in this implementation.
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.Sh SEE ALSO
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.Xr sort 1
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.1-2001
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as amended by Cor.\& 1-2002.
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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 v3 .
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