1 .\" $NetBSD: uniq.1,v 1.12 2010/10/06 06:43:26 dholland Exp $
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33 .\" @(#)uniq.1 8.1 (Berkeley) 6/6/93
40 .Nd report or filter out repeated lines in a file
53 utility reads the standard input comparing adjacent lines, and writes
54 a copy of each unique input line to the standard output.
55 The second and succeeding copies of identical adjacent input lines are
57 Repeated lines in the input will not be detected if they are not adjacent,
58 so it may be necessary to sort the files first.
60 The following options are available:
63 Precede each output line with the count of the number of times the line
64 occurred in the input, followed by a single space.
66 Don't output lines that are not repeated in the input.
70 in each input line when doing comparisons.
71 A field is a string of non-blank characters separated from adjacent fields
73 Field numbers are one based, i.e. the first field is field one.
77 characters in each input line when doing comparisons.
78 If specified in conjunction with the
82 characters after the first
84 fields will be ignored.
85 Character numbers are one based, i.e. the first character is character one.
87 Don't output lines that are repeated in the input.
89 .\"(Deprecated; replaced by
92 .\"fields on each input line when doing comparisons,
93 .\"where n is a number.
94 .\"A field is a string of non-blank
95 .\"characters separated from adjacent fields
97 .\".It Cm \&\(pl Ns Ar n
98 .\"(Deprecated; replaced by
102 .\"characters when doing comparisons, where
108 If additional arguments are specified on the command line, the first
109 such argument is used as the name of an input file, the second is used
110 as the name of an output file.
114 utility exits 0 on success, and \*[Gt]0 if an error occurs.
117 .Cm \&\(pl Ns Ar number
120 options have been deprecated but are still supported in this implementation.
126 utility is expected to be