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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 destructive. Half-line characters and underlining
(changed to dashing `-') are placed on new lines in between the normal output lines.
- 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. Nor-
mally, 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
col(1), more(1), nroff(1), troff(1), ul(1)
The colcrt command appeared in 3.0BSD.
Should fold underlines onto blanks even with the '-' option so that a true underline charac-
ter 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.
BSD June 30, 1993 BSD
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