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33 .\" @(#)col.1 8.1 (Berkeley) 6/29/93
40 .Nd filter reverse line feeds from input
47 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.
50 This can be useful in processing the output of
56 reads from the standard input and writes to the standard output.
58 The options are as follows:
59 .Bl -tag -width "-l num "
61 Do not output any backspaces, printing only the last character
62 written to each column position.
64 Forward half line feeds are permitted (``fine'' mode).
65 Normally characters printed on a half line boundary are printed
66 on the following line.
68 Force unknown control sequences to be passed through unchanged.
71 will filter out any control sequences from the input other than those
72 recognized and interpreted by itself, which are listed below.
74 Output multiple spaces instead of tabs.
79 By default, 128 lines are buffered.
82 The control sequences for carriage motion that
84 understands and their decimal values are listed in the following
87 .Bl -tag -width "carriage return" -compact
89 reverse line feed (escape then 7)
91 half reverse line feed (escape then 8)
93 half forward line feed (escape then 9)
95 moves back one column (8); ignored in the first column
99 forward line feed (10); also does carriage return
101 shift to normal character set (15)
103 shift to alternative character set (14)
105 moves forward one column (32)
107 moves forward to next tab stop (9)
109 reverse line feed (11)
112 All unrecognized control characters and escape sequences are
116 keeps track of the character set as characters are read and makes
117 sure the character set is correct when they are output.
119 If the input attempts to back up to the last flushed line,
121 will display a warning message.
133 option is an extension to the standard.