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31 .\" @(#)col.1 8.1 (Berkeley) 6/29/93
39 .Nd filter reverse line feeds from input
47 utility filters out reverse (and half reverse) line feeds so that the output is
48 in the correct order with only forward and half forward line
49 feeds, and replaces white-space characters with tabs where possible.
53 utility reads from the standard input and writes to the standard output.
55 The options are as follows:
56 .Bl -tag -width indent
58 Do not output any backspaces, printing only the last character
59 written to each column position.
61 Forward half line feeds are permitted (``fine'' mode).
62 Normally characters printed on a half line boundary are printed
63 on the following line.
65 Do not output multiple spaces instead of tabs (default).
70 By default, 128 lines are buffered.
72 Force unknown control sequences to be passed through unchanged.
75 will filter out any control sequences from the input other than those
76 recognized and interpreted by itself, which are listed below.
78 Output multiple spaces instead of tabs.
83 understands both the escape sequences of the form escape-digit
88 format escape-control-character.
89 The control sequences for carriage motion and their ASCII values
92 .Bl -tag -width "carriage return" -compact
94 reverse line feed (escape then bell).
96 reverse line feed (escape then 7).
98 half reverse line feed (escape then backspace).
100 half reverse line feed (escape then 8).
102 half forward line feed (escape than tab).
104 half forward line feed (escape then 9).
107 mode, this sequence may also occur in the output stream.
109 moves back one column (8); ignored in the first column
113 forward line feed (10); also does carriage return
115 shift to normal character set (15)
117 shift to alternate character set (14)
119 moves forward one column (32)
121 moves forward to next tab stop (9)
123 reverse line feed (11)
126 All unrecognized control characters and escape sequences are
131 utility keeps track of the character set as characters are read and makes
132 sure the character set is correct when they are output.
134 If the input attempts to back up to the last flushed line,
136 will display a warning message.
142 environment variables affect the execution of
151 to filter the output of
153 and remove the backspace characters (
155 ) before searching for some text:
156 .Bd -literal -offset indent
157 man ls | col -b | grep HISTORY