Annotation of src/usr.bin/cut/cut.1, Revision 1.20
1.20 ! sobrado 1: .\" $OpenBSD: cut.1,v 1.19 2012/06/10 06:22:56 jmc Exp $
1.1 deraadt 2: .\" $NetBSD: cut.1,v 1.6 1995/10/02 20:19:26 jtc Exp $
3: .\"
4: .\" Copyright (c) 1989, 1990, 1993
5: .\" The Regents of the University of California. All rights reserved.
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7: .\" This code is derived from software contributed to Berkeley by
8: .\" the Institute of Electrical and Electronics Engineers, Inc.
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11: .\" modification, are permitted provided that the following conditions
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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.
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34: .\" @(#)cut.1 8.1 (Berkeley) 6/6/93
35: .\"
1.20 ! sobrado 36: .Dd $Mdocdate: June 10 2012 $
1.1 deraadt 37: .Dt CUT 1
38: .Os
39: .Sh NAME
40: .Nm cut
41: .Nd select portions of each line of a file
42: .Sh SYNOPSIS
43: .Nm cut
44: .Fl b Ar list
45: .Op Fl n
46: .Op Ar
47: .Nm cut
48: .Fl c Ar list
49: .Op Ar
50: .Nm cut
51: .Fl f Ar list
1.13 sobrado 52: .Op Fl s
1.1 deraadt 53: .Op Fl d Ar delim
54: .Op Ar
55: .Sh DESCRIPTION
56: The
1.5 aaron 57: .Nm
1.1 deraadt 58: utility selects portions of each line (as specified by
1.6 aaron 59: .Ar list )
1.1 deraadt 60: from each
61: .Ar file
62: (or the standard input by default), and writes them to the
63: standard output.
64: The items specified by
65: .Ar list
66: can be in terms of column position or in terms of fields delimited
1.6 aaron 67: by a special character.
1.19 jmc 68: Column and field numbering starts from 1.
1.1 deraadt 69: .Pp
1.3 aaron 70: .Ar list
1.16 schwarze 71: is a comma or whitespace separated set of numbers and/or
1.1 deraadt 72: number ranges.
73: Number ranges consist of a number, a dash
1.3 aaron 74: .Pq Sq \- ,
1.1 deraadt 75: and a second number
1.6 aaron 76: which select the fields or columns from the first number to the second,
1.1 deraadt 77: inclusive.
78: Numbers or number ranges may be preceded by a dash, which selects all
79: fields or columns from 1 to the first number.
80: Numbers or number ranges may be followed by a dash, which selects all
81: fields or columns from the last number to the end of the line.
82: Numbers and number ranges may be repeated, overlapping, and in any order.
83: It is not an error to select fields or columns not present in the
84: input line.
85: .Pp
86: The options are as follows:
1.7 aaron 87: .Bl -tag -width Ds
1.1 deraadt 88: .It Fl b Ar list
1.4 aaron 89: The
1.1 deraadt 90: .Ar list
91: specifies byte positions.
92: .It Fl c Ar list
93: The
94: .Ar list
95: specifies character positions.
1.10 jmc 96: .It Fl d Ar delim
1.1 deraadt 97: Use the first character of
1.10 jmc 98: .Ar delim
1.14 jmc 99: as the field delimiter character.
100: The default is the
101: .Aq TAB
102: character.
1.1 deraadt 103: .It Fl f Ar list
104: The
105: .Ar list
1.14 jmc 106: specifies fields, separated by the field delimiter character.
107: The selected fields are output,
108: separated by the field delimiter character.
1.1 deraadt 109: .It Fl n
110: Do not split multi-byte characters.
111: .It Fl s
112: Suppresses lines with no field delimiter characters.
113: Unless specified, lines with no delimiters are passed through unmodified.
114: .El
1.17 jmc 115: .Sh EXIT STATUS
1.18 jmc 116: .Ex -std cut
1.9 jmc 117: .Sh EXAMPLES
118: Extract login names and shells from the system
119: .Xr passwd 5
120: file as
121: .Dq name:shell
122: pairs:
123: .Pp
124: .Dl "$ cut -d : -f 1,7 /etc/passwd"
125: .Pp
126: Show the names and login times of logged in users:
127: .Pp
1.20 ! sobrado 128: .Dl "$ who | cut -c 1-8,18-30"
1.1 deraadt 129: .Sh SEE ALSO
130: .Xr paste 1
131: .Sh STANDARDS
132: The
1.5 aaron 133: .Nm
1.11 jmc 134: utility is compliant with the
1.15 jmc 135: .St -p1003.1-2008
1.11 jmc 136: specification.
1.16 schwarze 137: .Sh CAVEATS
138: The current implementation does not support multi-byte characters.
139: Consequently
140: .Fl c
141: does the same as
142: .Fl b ,
143: and
144: .Fl n
145: has no effect.
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