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@(#)colcrt.1 6.3 (Berkeley) 10/26/88

C 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.

The optional - suppresses all underlining. It is especially useful for previewing allboxed tables from tbl (1).

The option -2 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

nroff/troff(1), col(1), more(1), ul(1) Should fold underlines onto blanks even with the `-' option so that a true underline character would show; if we did this, however, colcrt wouldn't get rid of cu'd underlining completely.

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.