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31 .\" @(#)col.1 8.1 (Berkeley) 6/29/93
32 .\" $FreeBSD: src/usr.bin/col/col.1,v 1.4.2.7 2002/07/15 04:32:27 keramida Exp $
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40 .Nd filter reverse line feeds from input
48 utility filters out reverse (and half reverse) line feeds so that the output is
49 in the correct order with only forward and half forward line
50 feeds, and replaces white-space characters with tabs where possible.
51 This can be useful in processing the output of
58 utility reads from the standard input and writes to the standard output.
60 The options are as follows:
61 .Bl -tag -width indent
63 Do not output any backspaces, printing only the last character
64 written to each column position.
66 Forward half line feeds are permitted (``fine'' mode).
67 Normally characters printed on a half line boundary are printed
68 on the following line.
70 Don't output multiple spaces instead of tabs (default).
75 By default, 128 lines are buffered.
77 Force unknown control sequences to be passed through unchanged.
80 will filter out any control sequences from the input other than those
81 recognized and interpreted by itself, which are listed below.
83 Output multiple spaces instead of tabs.
86 The control sequences for carriage motion that
88 understands and their decimal values are listed in the following
91 .Bl -tag -width "carriage return" -compact
93 reverse line feed (escape then 7)
95 half reverse line feed (escape then 8)
97 half forward line feed (escape then 9)
99 moves back one column (8); ignored in the first column
103 forward line feed (10); also does carriage return
105 shift to normal character set (15)
107 shift to alternate character set (14)
109 moves forward one column (32)
111 moves forward to next tab stop (9)
113 reverse line feed (11)
116 All unrecognized control characters and escape sequences are
121 utility keeps track of the character set as characters are read and makes
122 sure the character set is correct when they are output.
124 If the input attempts to back up to the last flushed line,
126 will display a warning message.