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.
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
nroff(1) , troff(1) , col(1) , more(1) , ul(1)
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.
The colcrt command appeared in 3.0BSD.
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