Name

colcrt — filter nroff output for CRT previewing

Synopsis

colcrt [options] [ 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.

OPTIONS

, −−no−underlining

Suppress all underlining. This option is especially useful for previewing allboxed tables from tbl(1).

−2, −−half−lines

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, −−version

Output version information and exit.

−h, −−help

Output help and exit.

EXAMPLES

A typical use of colcrt would be

tbl exum2.n | nroff −ms | colcrt − | more

SEE ALSO

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

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.

HISTORY

The colcrt command appeared in 3.0BSD.

AVAILABILITY

The colcrt command is part of the util-linux package and is available from Linux Kernel Archive


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    (#)colcrt.1 8.1 (Berkeley) 6/30/93