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