COLCRT(1) BSD Reference 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.
- 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.
3rd Berkeley Distribution June 30, 1993 1