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colcrtfilter

COLCRT(1) General Commands Manual COLCRT(1)

NAME

colcrtfilter 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 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

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 underlined correctly.
July 31, 2004 Debian Sid