DragonFly On-Line Manual Pages


COLCRT(1)	       DragonFly General Commands Manual	     COLCRT(1)

NAME

colcrt -- filter nroff output for CRT previewing

SYNOPSIS

colcrt [-] [-2] [file ...]

DESCRIPTION

The colcrt utility provides virtual half-line and reverse line feed sequences for terminals without such capability, and on which overstrik- ing 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

SEE ALSO

col(1), more(1), nroff(1), troff(1), ul(1)

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 under- lined correctly. DragonFly 4.1 December 30, 2013 DragonFly 4.1