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
col(1),
more(1),
nroff(1),
troff(1),
ul(1)
HISTORY
The
colcrt command appeared in
1BSD.
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.