COLCRT(1) | FreeBSD General Commands Manual | COLCRT(1) |
NAME
colcrt — filter nroff output for CRT previewingSYNOPSIS
colcrt | [ -][ -2][ file ...] |
DESCRIPTION
The colcrt utility 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 following options are available:
- -
- Suppress all underlining. This option is especially useful for previewing allboxed tables from tbl(1).
- -2
- Cause 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.
ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colcrt as described in environ(7).EXIT STATUS
The colcrt utility exits 0 on success, and >0 if an error occurs.EXAMPLES
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
HISTORY
The colcrt command appeared in 3.0BSD.BUGS
Should fold underlines onto blanks even with the ‘ -’ option so that a true underline character would show.Cannot 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.
Characters that take up more than one column position may not be underlined correctly.
July 31, 2004 | FreeBSD |