colcrt Man page

COLCRT(1) BSD General Commands Manual COLCRT(1)


colcrt — filter nroff output for CRT previewing


colcrt [-] [-2] [file …]


The colcrt utility provides virtual half-line and reverse line feed
sequences for terminals without such capability, and on which overstrik‐
ing is destructive. Half-line characters and underlining (changed to
dashing `-‘) are placed on new lines in between the normal output lines.

The following options are available:

– Suppress all underlining. This option is especially useful for
previewing allboxed tables from tbl.

-2 Cause all half-lines to be printed, effectively double spacing
the output. Normally, a minimal space output format is used
which will suppress empty lines. The program never suppresses
two consecutive empty lines, however. The -2 option is useful
for sending output to the line printer when the output contains
superscripts and subscripts which would otherwise be invisible.

The LANG, LC_ALL and LC_CTYPE environment variables affect the execution
of colcrt as described in environ(7).

The colcrt utility exits 0 on success, and >0 if an error occurs.

A typical use of colcrt would be

tbl exum2.n | nroff -ms | colcrt – | more


col, more, nroff, troff, ul

The colcrt command appeared in 3.0BSD.


Should fold underlines onto blanks even with the ‘-’ option so that a
true underline character would show.

Cannot back up more than 102 lines.

General overstriking is lost; as a special case ‘|’ overstruck with ‘-’
or underline becomes ‘+’.

Lines are trimmed to 132 characters.

Some provision should be made for processing superscripts and subscripts
in documents which are already double-spaced.

Characters that take up more than one column position may not be under‐
lined correctly.

BSD July 31, 2004 BSD

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