71 lines
1.3 KiB
Groff
71 lines
1.3 KiB
Groff
.Dd March 22, 2014
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.Dt COL 1
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.Os sbase
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.Sh NAME
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.Nm col
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.Nd filter reverse line-feeds
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.Sh SYPNOSIS
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.Nm
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.Op Fl bfpx
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.Op Fl l Ar num
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.Sh DESCRIPTION
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.Nm
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filters all reverse (and half reverse) line feeds,
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as produced by
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.Xr nroff 1
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with .2C,
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.Xr ms 6
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or
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.Xr tbl 1 .
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The recognized control sequences are:
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.Bl -tag -width Ds
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.It ESC-7
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Reverse line-feed
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.It ESC-8
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Reverse half-line-feed
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.It ESC-9
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Forward half-line-feed
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.It VT
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Vertical-tab
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.It SP
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Space
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.It TAB
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Horizontal tab
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.It RETURN
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Carriage return
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.It NL
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New line
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.El
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.Pp
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All other control codes and escape sequences are removed.
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.Nm
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converts all spaces to tabs.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl p
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Print unknown escape sequences.
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.It Fl b
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Do not print backspaces and instead only print the last
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character written to each column position.
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.It Fl f
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Allow forward half line feeds in the output.
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.It Fl x
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Do not convert spaces to tabs.
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.It Fl l Ar num
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Buffer
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.Ar num
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lines in memory. By default, 128 lines are buffered.
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.El
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.Sh SEE ALSO
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.Xr nroff 1 ,
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.Xr tbl 1 ,
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.Xr ms 6
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.Sh BUGS
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.Nm
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only buffers up to 128 lines with up to 800 bytes per line
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if the line-number hasn't been set differently with the
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.Op Fl l
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flag.
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When the number of lines is bigger, the buffer is flushed and
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reverse line feeds can not operate on the flushed lines.
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