colcrt - filter nroff output for CRT previewing SYNOPSIS

colcrt [-? [-2? [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.

The following options are available
  • Suppress all underlining. This option is especiallyuseful for previewing allboxed tables from tbl


  • 2

Cause all half-lines to be printed, effectively dou- ble 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 oth- erwise be invisible.


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) 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 3.0 BSD .

BSD June 30, 1993 1

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