fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
152 lines
4.3 KiB
Groff
152 lines
4.3 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 17, 2009
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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 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
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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
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Only output lines that are repeated in the input.
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.It Fl f 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 s 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
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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
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Only output lines that are not repeated in the input.
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.It Fl i
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Case insensitive comparison of lines.
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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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