81 lines
1.5 KiB
Groff
81 lines
1.5 KiB
Groff
.Dd March 6, 2014
|
|
.Dt COL 1
|
|
.Os sbase
|
|
.Sh NAME
|
|
.Nm col
|
|
.Nd filter reverse line-feeds
|
|
.Sh SYPNOSIS
|
|
.Nm
|
|
.Op Fl bfpx
|
|
.Op Fl l Ar num
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility filters all the reverse (and half reverse) line feeds,
|
|
as they are produced by
|
|
.Xr nroff 1
|
|
with .2C of
|
|
.Xr ms 6
|
|
or by
|
|
.Xr tbl 1 .
|
|
.Nm
|
|
also replaces spaces by tabs when it is possible.
|
|
The control sequences managed by
|
|
.Nm
|
|
are:
|
|
.Bl -tag -width Ds
|
|
.It ESC-7
|
|
Reverse line-feed
|
|
.It ESC-8
|
|
Reverse half-line-feed
|
|
.It ESC-9
|
|
Forward half-line-feed
|
|
.It VT
|
|
Vertical-tab
|
|
.It SP
|
|
Space
|
|
.It TAB
|
|
Horizontal tab
|
|
.It RETURN
|
|
Carriage return
|
|
.It NL
|
|
New line
|
|
.El
|
|
.Pp
|
|
All the other control codes and escape sequences are removed.
|
|
.Nm
|
|
transforms all the spaces into tabulators.
|
|
.Sh OPTIONS
|
|
.Bl -tag -width Ds
|
|
.It Fl p
|
|
Print unknown escape sequences to the output.
|
|
.It Fl b
|
|
Do not print backspaces in output,
|
|
and print only the last overstriked character in the output.
|
|
.It Fl f
|
|
Allow forward half line feeds in the output.
|
|
.It Fl x
|
|
Do not convert spaces in tabulators.
|
|
.It Fl l Ar num
|
|
Increment to
|
|
.Ar num
|
|
the number of lines buffered for
|
|
.Nm
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr nroff 1 ,
|
|
.Xr tbl 1 ,
|
|
.Xr ms 6
|
|
.Sh BUGS
|
|
.Nm
|
|
only process text with a maximum of 256 lines with 800 bytes per line,
|
|
although the number of lines can be modified with the
|
|
.Fl l
|
|
option.
|
|
When the number of lines is bigger,
|
|
the buffer is flushed to the output,
|
|
so new reverse line feeds can not operate in the flushed lines.
|
|
This implementation ignores SI and SO selection character sets,
|
|
because it is supposed to work only with UTF-8 strings,
|
|
although the UTF-8 support is missed.
|