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 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 all boxed 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 that would otherwise be invisible.|