mirror of https://github.com/GnoConsortium/gno.git
142 lines
4.6 KiB
Groff
142 lines
4.6 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. 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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.\" From: @(#)uniq.1 8.1 (Berkeley) 6/6/93
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.\" $Id: uniq.1,v 1.1 1997/12/02 05:15:26 gdr Exp $
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.\"
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.TH UNIQ 1 "November 1997" "GNO" "Commands and Applications"
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.SH NAME
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.BR uniq
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\- report or filter out repeated lines in a file
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.SH SYNOPSIS
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.BR uniq
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.RB [ -c " | " -du ]
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.RB [ -i ]
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.RB [ -f
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.IR fields ]
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.RB [ -s
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.IR chars ]
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.RI [ input
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.RI [ output "]]"
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.PP
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.I Obsolescent:
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.PP
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.BR uniq " [\c"
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.BI - fields\c
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.RI "] [\c"
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.BI + chars\c
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.RI "] [" input
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.RI [ output "]]"
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.SH DESCRIPTION
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The
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.BR 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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.RS
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.IP \fB-c\fR
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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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.IP \fB-d\fR
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Print one copy of each repeated line in the input.
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.IP "\fB-f\fR \fIfields\fR"
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Ignore the first
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.IR 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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.IP "\fB-s\fR \fIchars\fR"
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Ignore the first
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.IR 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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.BR -f
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option, the first
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.IR chars
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characters after the first
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.IR 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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.IP \fB-u\fR
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Print lines that are not repeated in the input.
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.IP \fB-i\fR
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Case insensitive comparison of lines.
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.RE
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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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If neither of the options
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.BR d " or " u
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are specified on the command line,
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.BR uniq
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behaves as if both
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.BR d " and " u
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are set, printing a single copy of repeated lines as well as unrepeated lines.
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.PP
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The
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.BR 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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.BI + number
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and
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.BI - number
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options have been deprecated but are still supported in this implementation.
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.SH VERSION
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This manual page documents
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.BR uniq
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version 2.0.
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.SH ATTRIBUTIONS
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This command was ported from FreeBSD source code
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for distribution with GNO/ME 2.0.6.
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.SH HISTORY
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A version of
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.BR uniq
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written in 1992 was distributed with
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earlier releases of GNO.
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.SH SEE ALSO
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.BR sort (1)
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.SH STANDARDS
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The
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.BR uniq
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utility is expected to be POSIX-2 compatible.
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