Annotation of src/usr.bin/uniq/uniq.1, Revision 1.20
1.20 ! tb 1: .\" $OpenBSD: uniq.1,v 1.19 2016/10/24 13:46:58 schwarze Exp $
1.1 deraadt 2: .\" $NetBSD: uniq.1,v 1.5 1994/12/06 07:51:15 jtc Exp $
3: .\"
4: .\" Copyright (c) 1991, 1993
5: .\" The Regents of the University of California. All rights reserved.
6: .\"
7: .\" This code is derived from software contributed to Berkeley by
8: .\" the Institute of Electrical and Electronics Engineers, Inc.
9: .\"
10: .\" Redistribution and use in source and binary forms, with or without
11: .\" modification, are permitted provided that the following conditions
12: .\" are met:
13: .\" 1. Redistributions of source code must retain the above copyright
14: .\" notice, this list of conditions and the following disclaimer.
15: .\" 2. Redistributions in binary form must reproduce the above copyright
16: .\" notice, this list of conditions and the following disclaimer in the
17: .\" documentation and/or other materials provided with the distribution.
1.8 millert 18: .\" 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 19: .\" may be used to endorse or promote products derived from this software
20: .\" without specific prior written permission.
21: .\"
22: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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29: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: .\" SUCH DAMAGE.
33: .\"
34: .\" @(#)uniq.1 8.1 (Berkeley) 6/6/93
35: .\"
1.20 ! tb 36: .Dd $Mdocdate: October 24 2016 $
1.1 deraadt 37: .Dt UNIQ 1
38: .Os
39: .Sh NAME
40: .Nm uniq
41: .Nd report or filter out repeated lines in a file
42: .Sh SYNOPSIS
43: .Nm uniq
1.20 ! tb 44: .Op Fl ci
1.14 kili 45: .Op Fl d | u
1.1 deraadt 46: .Op Fl f Ar fields
47: .Op Fl s Ar chars
48: .Oo
49: .Ar input_file
50: .Op Ar output_file
51: .Oc
52: .Sh DESCRIPTION
53: The
1.5 aaron 54: .Nm
1.3 aaron 55: utility reads the standard input comparing adjacent lines and writes
1.1 deraadt 56: a copy of each unique input line to the standard output.
57: The second and succeeding copies of identical adjacent input lines are
58: not written.
59: Repeated lines in the input will not be detected if they are not adjacent,
60: so it may be necessary to sort the files first.
61: .Pp
1.4 aaron 62: The options are as follows:
1.1 deraadt 63: .Bl -tag -width Ds
64: .It Fl c
65: Precede each output line with the count of the number of times the line
66: occurred in the input, followed by a single space.
67: .It Fl d
1.10 jmc 68: Only output lines which have duplicates.
1.1 deraadt 69: .It Fl f Ar fields
70: Ignore the first
71: .Ar fields
72: in each input line when doing comparisons.
73: A field is a string of non-blank characters separated from adjacent fields
1.13 kili 74: by blanks, with blanks considered part of the following field.
1.5 aaron 75: Field numbers are one based, i.e., the first field is field one.
1.20 ! tb 76: .It Fl i
! 77: Case insensitive comparison of lines.
1.1 deraadt 78: .It Fl s Ar chars
79: Ignore the first
80: .Ar chars
81: characters in each input line when doing comparisons.
82: If specified in conjunction with the
83: .Fl f
84: option, the first
85: .Ar chars
86: characters after the first
87: .Ar fields
88: fields will be ignored.
1.5 aaron 89: Character numbers are one based, i.e., the first character is character one.
1.1 deraadt 90: .It Fl u
1.10 jmc 91: Only output lines which are unique.
1.1 deraadt 92: .\".It Fl Ns Ar n
93: .\"(Deprecated; replaced by
94: .\".Fl f ) .
95: .\"Ignore the first n
96: .\"fields on each input line when doing comparisons,
97: .\"where n is a number.
98: .\"A field is a string of non-blank
99: .\"characters separated from adjacent fields
100: .\"by blanks.
101: .\".It Cm \&\(pl Ns Ar n
102: .\"(Deprecated; replaced by
103: .\".Fl s ) .
104: .\"Ignore the first
105: .\".Ar m
106: .\"characters when doing comparisons, where
107: .\".Ar m
108: .\"is a
109: .\"number.
110: .El
111: .Pp
112: If additional arguments are specified on the command line, the first
113: such argument is used as the name of an input file, the second is used
114: as the name of an output file.
1.6 millert 115: A file name of
116: .Ql -
1.7 hugh 117: denotes the standard input or the standard output
118: .Pq depending on its position on the command line .
1.18 schwarze 119: .Sh ENVIRONMENT
120: .Bl -tag -width LC_CTYPE
121: .It Ev LC_CTYPE
1.19 schwarze 122: The character encoding
1.18 schwarze 123: .Xr locale 1 .
1.19 schwarze 124: It decides which byte sequences form characters
1.18 schwarze 125: and which characters are considered blank.
1.19 schwarze 126: If unset or set to
127: .Qq C ,
128: .Qq POSIX ,
129: or an unsupported value, each byte is treated as a character,
130: and only space and tab are considered blank.
1.18 schwarze 131: .El
1.17 jmc 132: .Sh EXIT STATUS
1.15 sobrado 133: .Ex -std uniq
1.5 aaron 134: .Sh SEE ALSO
135: .Xr sort 1
1.9 jmc 136: .Sh STANDARDS
1.11 jmc 137: The
138: .Nm
139: utility is compliant with the
1.16 jmc 140: .St -p1003.1-2008
1.11 jmc 141: specification.
1.14 kili 142: .Pp
1.20 ! tb 143: The
! 144: .Fl i
! 145: option and the use of
1.14 kili 146: .Fl c
147: in conjunction with
148: .Fl d
149: or
150: .Fl u
1.20 ! tb 151: are extensions to that specification.
1.11 jmc 152: .Pp
1.1 deraadt 153: The historic
1.10 jmc 154: .Cm + Ns Ar number
1.1 deraadt 155: and
156: .Fl Ns Ar number
157: options have been deprecated but are still supported in this implementation.
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