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4 .\" This code is derived from software contributed to Berkeley by
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31 .\" From: @(#)uniq.1 8.1 (Berkeley) 6/6/93
39 .Nd report or filter out repeated lines in a file
42 .Op Fl c | Fl d | Fl u
53 utility reads the specified
55 comparing adjacent lines, and writes a copy of each unique input line to
62 or absent, the standard input is read.
65 is absent, standard output is used for output.
66 The second and succeeding copies of identical adjacent input lines are
68 Repeated lines in the input will not be detected if they are not adjacent,
69 so it may be necessary to sort the files first.
71 The following options are available:
74 Precede each output line with the count of the number of times the line
75 occurred in the input, followed by a single space.
77 Only output lines that are repeated in the input.
81 fields in each input line when doing comparisons.
82 A field is a string of non-blank characters separated from adjacent fields
84 Field numbers are one based, i.e., the first field is field one.
88 characters in each input line when doing comparisons.
89 If specified in conjunction with the
93 characters after the first
95 fields will be ignored.
96 Character numbers are one based, i.e., the first character is character one.
98 Only output lines that are not repeated in the input.
100 Case insensitive comparison of lines.
102 .\"(Deprecated; replaced by
104 .\"Ignore the first n
105 .\"fields on each input line when doing comparisons,
106 .\"where n is a number.
107 .\"A field is a string of non-blank
108 .\"characters separated from adjacent fields
110 .\".It Cm \&\(pl Ns Ar n
111 .\"(Deprecated; replaced by
115 .\"characters when doing comparisons, where
127 environment variables affect the execution of
135 .Cm \&\(pl Ns Ar number
138 options have been deprecated but are still supported in this implementation.
146 as amended by Cor.\& 1-2002.