d937171727
This adds a new -D/--all-repeats option to uniq(1), which outputs each copy of any repeated lines (as opposed to a single copy of a repeated line). You can specify a separator option to output a blank line before or after each group of repeated lines. This adds compatibility with the GNU coreutils version of uniq(1). This change also re-groups the -c, -d, -D, -u options in the usage display and man page to indicate that they are mutally exclusive of each other. This matches the posix/opengroup definition of uniq(1) command line args. Note that this change does NOT actually enforce the mutual exclusion in the code, for now, it simply documents that the arguments should be considered exclusive with each other. Differential Revision: https://reviews.freebsd.org/D22262
169 lines
4.9 KiB
Groff
169 lines
4.9 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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.\" From: @(#)uniq.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd December 15, 2019
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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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.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 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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