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

colcrt – filter nroff output for CRT previewing

colcrt [-] [-2] [file …]

Colcrt provides virtual half-line and reverse line feed sequences for
terminals without such capability, and on which overstriking is destruc-
tive. Half-line characters and underlining (changed to dashing `-‘) are
placed on new lines in between the normal output lines.

Available options:

– Suppress all underlining. This option is especially useful for
previewing allboxed tables from tbl(1).

-2 Causes 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.

A typical use of colcrt would be

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

nroff(1), troff(1), col(1), more(1), ul(1)

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

Can’t 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.

The colcrt command appeared in 3.0BSD.

The colcrt command is part of the util-linux-ng package and is available

3rd Berkeley Distribution June 30, 1993 3rd Berkeley Distribution

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