COLCRT(1) User Commands COLCRT(1)NAMEcolcrt - filter nroff output for CRT previewing
SYNOPSIScolcrt [options] [file ...]
DESCRIPTIONcolcrt 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).
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.
Output version information and exit.
Output help and exit.
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
SEE ALSOnroff(1), troff(1), col(1), more(1), ul(1)BUGS
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 sub‐
scripts in documents which are already double-spaced.
The colcrt command appeared in 3.0BSD.
The colcrt command is part of the util-linux package and is available
from Linux Kernel Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util-
util-linux September 2011 COLCRT(1)