colcrt (1) - Linux Manuals
colcrt: filter nroff output for CRT previewing
colcrt - filter nroff output for CRT previewing
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).
- 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.
- Display version information and exit.
- Display help text and exit.
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.
A typical use of colcrt would be:
tbl exum2.n | nroff -ms | colcrt - | more
For bug reports, use the issue tracker at <https://github.com/karelzak/util-linux/issues>.
The colcrt command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.