1 .\" Copyright (c) 1991, 1993
2 .\" The Regents of the University of California. All rights reserved.
4 .\" This code is derived from software contributed to Berkeley by
5 .\" the Institute of Electrical and Electronics Engineers, Inc.
7 .\" Redistribution and use in source and binary forms, with or without
8 .\" modification, are permitted provided that the following conditions
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11 .\" notice, this list of conditions and the following disclaimer.
12 .\" 2. Redistributions in binary form must reproduce the above copyright
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15 .\" 3. Neither the name of the University nor the names of its contributors
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19 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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25 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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31 .\" From: @(#)uniq.1 8.1 (Berkeley) 6/6/93
32 .\" $FreeBSD: src/usr.bin/uniq/uniq.1,v 1.5.2.5 2002/07/15 08:11:33 keramida Exp $
33 .\" $DragonFly: src/usr.bin/uniq/uniq.1,v 1.2 2003/06/17 04:29:33 dillon Exp $
40 .Nd report or filter out repeated lines in a file
43 .Op Fl c | Fl d | Fl u
54 utility reads the specified
56 comparing adjacent lines, and writes a copy of each unique input line to
63 or absent, the standard input is read.
66 is absent, standard output is used for output.
67 The second and succeeding copies of identical adjacent input lines are
69 Repeated lines in the input will not be detected if they are not adjacent,
70 so it may be necessary to sort the files first.
72 The following options are available:
75 Precede each output line with the count of the number of times the line
76 occurred in the input, followed by a single space.
78 Only output lines that are repeated in the input.
82 fields in each input line when doing comparisons.
83 A field is a string of non-blank characters separated from adjacent fields
85 Field numbers are one based, i.e. the first field is field one.
89 characters in each input line when doing comparisons.
90 If specified in conjunction with the
94 characters after the first
96 fields will be ignored.
97 Character numbers are one based, i.e. the first character is character one.
99 Only output lines that are not repeated in the input.
101 Case insensitive comparison of lines.
103 .\"(Deprecated; replaced by
105 .\"Ignore the first n
106 .\"fields on each input line when doing comparisons,
107 .\"where n is a number.
108 .\"A field is a string of non-blank
109 .\"characters separated from adjacent fields
111 .\".It Cm \&\(pl Ns Ar n
112 .\"(Deprecated; replaced by
116 .\"characters when doing comparisons, where
122 If additional arguments are specified on the command line, the first
123 argument is used as the name of an input file, the second is used
124 as the name of an output file.
129 .Cm \&\(pl Ns Ar number
132 options have been deprecated but are still supported in this implementation.
138 utility is expected to be