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.

Available options:

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.

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