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COLCRT(1) General Commands Manual 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.

Available options:

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

A typical use of colcrt would be

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

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

The colcrt command appeared in 1BSD.

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.

June 30, 1993 NetBSD-9.2