NAME
colcrt - filter nroff output for CRT previewing
SYNOPSIS
colcrt [- ] [-2 ] [file ... ]
DESCRIPTION
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 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.
EXAMPLES
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
SEE ALSO
nroff(1),
troff(1),
col(1),
more(1),
ul(1)
BUGS
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.
HISTORY
The colcrt command appeared in BSD 3.0