colcrt (1) Linux Manual Page
colcrt – filter nroff output for CRT previewing
Synopsis
colcrt [options] [file …]Description
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.Options
–, –no-underlining- Suppress all underlining. This option is especially useful for previewing allboxed tables from tbl(1).
-2, –half-lines
- 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.
-V, –version
- Display version information and exit.
-h, –help
- Display help text and exit.
History
The colcrt command appeared in 3.0BSD.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 subscripts in documents which are already double-spaced.
Examples
A typical use of colcrt would be:- tbl exum2.n | nroff -ms | colcrt – | more