text_cmds/col/col.1

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  35 .\"     @(#)col.1       8.1 (Berkeley) 6/29/93
  36 .\" $FreeBSD: src/usr.bin/col/col.1,v 1.19 2005/02/13 22:25:20 ru Exp $
  37 .\"
  38 .Dd August 4, 2004
  39 .Dt COL 1
  40 .Os
  41 .Sh NAME
  42 .Nm col
  43 .Nd filter reverse line feeds from input
  44 .Sh SYNOPSIS
  45 .Nm
  46 .Op Fl bfhpx
  47 .Op Fl l Ar num
  48 .Sh DESCRIPTION
  49 The
  50 .Nm
  51 utility filters out reverse (and half reverse) line feeds so that the output is
  52 in the correct order with only forward and half forward line
  53 feeds, and replaces white-space characters with tabs where possible.
  54 This can be useful in processing the output of
  55 .Xr nroff 1
  56 and
  57 .Xr tbl 1 .
  58 .Pp
  59 The
  60 .Nm
  61 utility reads from the standard input and writes to the standard output.
  62 .Pp
  63 The options are as follows:
  64 .Bl -tag -width indent
  65 .It Fl b
  66 Do not output any backspaces, printing only the last character
  67 written to each column position.
  68 .It Fl f
  69 Forward half line feeds are permitted (``fine'' mode).
  70 Normally characters printed on a half line boundary are printed
  71 on the following line.
  72 .It Fl h
  73 Do not output multiple spaces instead of tabs (default).
  74 .It Fl l Ar num
  75 Buffer at least
  76 .Ar num
  77 lines in memory.
  78 By default, 128 lines are buffered.
  79 .It Fl p
  80 Force unknown control sequences to be passed through unchanged.
  81 Normally,
  82 .Nm
  83 will filter out any control sequences from the input other than those
  84 recognized and interpreted by itself, which are listed below.
  85 .It Fl x
  86 Output multiple spaces instead of tabs.
  87 .El
  88 .Pp
  89 The control sequences for carriage motion that
  90 .Nm
  91 understands and their decimal values are listed in the following
  92 table:
  93 .Pp
  94 .Bl -tag -width "carriage return" -compact
  95 .It ESC\-7
  96 reverse line feed (escape then 7)
  97 .It ESC\-8
  98 half reverse line feed (escape then 8)
  99 .It ESC\-9
 100 half forward line feed (escape then 9)
 101 .It backspace
 102 moves back one column (8); ignored in the first column
 103 .It carriage return
 104 (13)
 105 .It newline
 106 forward line feed (10); also does carriage return
 107 .It shift in
 108 shift to normal character set (15)
 109 .It shift out
 110 shift to alternate character set (14)
 111 .It space
 112 moves forward one column (32)
 113 .It tab
 114 moves forward to next tab stop (9)
 115 .It vertical tab
 116 reverse line feed (11)
 117 .El
 118 .Pp
 119 All unrecognized control characters and escape sequences are
 120 discarded.
 121 .Pp
 122 The
 123 .Nm
 124 utility keeps track of the character set as characters are read and makes
 125 sure the character set is correct when they are output.
 126 .Pp
 127 If the input attempts to back up to the last flushed line,
 128 .Nm
 129 will display a warning message.
 130 .Sh ENVIRONMENT
 131 The
 132 .Ev LANG , LC_ALL
 133 and
 134 .Ev LC_CTYPE
 135 environment variables affect the execution of
 136 .Nm
 137 as described in
 138 .Xr environ 7 .
 139 .Sh EXIT STATUS
 140 .Ex -std
 141 .Sh SEE ALSO
 142 .Xr colcrt 1 ,
 143 .Xr expand 1 ,
 144 .Xr nroff 1 ,
 145 .Xr tbl 1
 146 .Sh STANDARDS
 147 The
 148 .Nm
 149 utility conforms to
 150 .St -susv2 .
 151 .Sh HISTORY
 152 A
 153 .Nm
 154 command
 155 appeared in
 156 .At v6 .