Linux 2.6 - man page for colcrt (linux section 1)
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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 overstriking is destructive. Half-line characters and
underlining (changed to dashing `-') are placed on new lines in between the normal output
The following options are available:
- Suppress all underlining. This option is especially useful for previewing allboxed
tables from tbl(1).
-2 Cause 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.
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(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.
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 underlined correctly.
BSD July 31, 2004 BSD
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