BSD 2.11 - man page for colcrt (bsd section 1)
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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
The optional - suppresses all underlining. It is especially useful for previewing all-
boxed tables from tbl(1).
The option -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 pro-
gram 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.
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
nroff/troff(1), col(1), more(1), ul(1)
Should fold underlines onto blanks even with the `-' option so that a true underline char-
acter would show; if we did this, however, colcrt wouldn't get rid of cu'd underlining
Can't back up more than 102 lines.
General overstriking is lost; as a special case `|' overstruck with `-' or underline
Lines are trimmed to 132 characters.
Some provision should be made for processing superscripts and subscripts in documents
which are already double-spaced.
3rd Berkeley Distribution May 7, 1986 COLCRT(1)
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