COLCRT(1) Commands and Applications COLCRT(1)
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.
- 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.
-V Prints version information and exits.
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
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 sub-
scripts in documents which are already double-spaced.
The colcrt command appeared in 3.0BSD.
This command was ported from FreeBSD source code for distribution with
This program contains material from the ORCA/C Run-Time Libraries,
copyright 1987-1998 by Byte Works, Inc. Used with permission.
col(1), more(1), nroff(1), troff(1), ul(1)
GNO January 22, 1998 COLCRT(1)
Man(1) output converted with