text_cmds/cut/cut.1

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  35 .\"     @(#)cut.1       8.1 (Berkeley) 6/6/93
  36 .\" $FreeBSD: src/usr.bin/cut/cut.1,v 1.32 2007/02/28 10:13:32 ru Exp $
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  38 .Dd December 21, 2006
  39 .Dt CUT 1
  40 .Os
  41 .Sh NAME
  42 .Nm cut
  43 .Nd cut out selected portions of each line of a file
  44 .Sh SYNOPSIS
  45 .Nm
  46 .Fl b Ar list
  47 .Op Fl n
  48 .Op Ar
  49 .Nm
  50 .Fl c Ar list
  51 .Op Ar
  52 .Nm
  53 .Fl f Ar list
  54 .Op Fl d Ar delim
  55 .Op Fl s
  56 .Op Ar
  57 .Sh DESCRIPTION
  58 The
  59 .Nm
  60 utility cuts out selected portions of each line (as specified by
  61 .Ar list )
  62 from each
  63 .Ar file
  64 and writes them to the standard output.
  65 If no
  66 .Ar file
  67 arguments are specified, or a file argument is a single dash
  68 .Pq Sq Fl ,
  69 .Nm
  70 reads from the standard input.
  71 The items specified by
  72 .Ar list
  73 can be in terms of column position or in terms of fields delimited
  74 by a special character.
  75 Column numbering starts from 1.
  76 .Pp
  77 The
  78 .Ar list
  79 option argument
  80 is a comma or whitespace separated set of numbers and/or
  81 number ranges.
  82 Number ranges consist of a number, a dash
  83 .Pq Sq \- ,
  84 and a second number
  85 and select the fields or columns from the first number to the second,
  86 inclusive.
  87 Numbers or number ranges may be preceded by a dash, which selects all
  88 fields or columns from 1 to the last number.
  89 Numbers or number ranges may be followed by a dash, which selects all
  90 fields or columns from the last number to the end of the line.
  91 Numbers and number ranges may be repeated, overlapping, and in any order.
  92 If a field or column is specified multiple times, it will appear only
  93 once in the output.
  94 It is not an error to select fields or columns not present in the
  95 input line.
  96 .Pp
  97 The options are as follows:
  98 .Bl -tag -width indent
  99 .It Fl b Ar list
 100 The
 101 .Ar list
 102 specifies byte positions.
 103 .It Fl c Ar list
 104 The
 105 .Ar list
 106 specifies character positions.
 107 .It Fl d Ar delim
 108 Use
 109 .Ar delim
 110 as the field delimiter character instead of the tab character.
 111 .It Fl f Ar list
 112 The
 113 .Ar list
 114 specifies fields, separated in the input by the field delimiter character
 115 (see the
 116 .Fl d
 117 option.)
 118 Output fields are separated by a single occurrence of the field delimiter
 119 character.
 120 .It Fl n
 121 Do not split multi-byte characters.
 122 Characters will only be output if at least one byte is selected, and,
 123 after a prefix of zero or more unselected bytes, the rest of the bytes
 124 that form the character are selected.
 125 .It Fl s
 126 Suppress lines with no field delimiter characters.
 127 Unless specified, lines with no delimiters are passed through unmodified.
 128 .El
 129 .Sh ENVIRONMENT
 130 The
 131 .Ev LANG , LC_ALL
 132 and
 133 .Ev LC_CTYPE
 134 environment variables affect the execution of
 135 .Nm
 136 as described in
 137 .Xr environ 7 .
 138 .Sh EXIT STATUS
 139 .Ex -std
 140 .Sh EXAMPLES
 141 Extract users' login names and shells from the system
 142 .Xr passwd 5
 143 file as
 144 .Dq name:shell
 145 pairs:
 146 .Pp
 147 .Dl "cut -d : -f 1,7 /etc/passwd"
 148 .Pp
 149 Show the names and login times of the currently logged in users:
 150 .Pp
 151 .Dl "who | cut -c 1-16,26-38"
 152 .Sh SEE ALSO
 153 .Xr colrm 1 ,
 154 .Xr paste 1
 155 .Sh STANDARDS
 156 The
 157 .Nm
 158 utility conforms to
 159 .St -p1003.2-92 .
 160 .Sh HISTORY
 161 A
 162 .Nm
 163 command appeared in
 164 .Tn AT&T
 165 System III
 166 .Ux .