131 lines
4.3 KiB
Groff
131 lines
4.3 KiB
Groff
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.\" 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" @(#)uniq.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd June 6, 1993
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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 uniq
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.Op Fl c | Fl d | Fl u
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.Op Fl f Ar fields
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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 uniq
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utility reads the standard input comparing adjacent lines, and writes
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a copy of each unique input line to the standard 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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Don't output lines that are not repeated in the input.
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.It Fl f Ar fields
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Ignore the first
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.Ar fields
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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 fields
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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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Don't output lines that are 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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.Pp
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If additional arguments are specified on the command line, the first
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such argument is used as the name of an input file, the second is used
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as the name of an output file.
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.Pp
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The
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.Nm uniq
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utility exits 0 on success, and >0 if an error occurs.
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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 uniq
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utility is expected to be
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.St -p1003.2
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compatible.
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