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.
The options are as follows:
- Suppress all underlining. This option is especially
useful for
previewing allboxed 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 which would otherwise be
invisible.
A typical use of colcrt would be
$ tbl exum2.n | nroff -ms | colcrt - | more
col(1), more(1), nroff(1), troff(1), ul(1)
The colcrt command appeared in 3.0BSD.
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.
OpenBSD 3.6 June 30, 1993
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