COLCRT(1)                                          BSD General Commands Manual                                         COLCRT(1)

NAME
     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 over-
     striking 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 allboxed tables from tbl(1).

     -2      Causes all half-lines to be printed, effectively double spacing the output.  Normally, a minimal space output for-
             mat 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.

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-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-
     linux-ng/.

3rd Berkeley Distribution                                 June 30, 1993                                3rd Berkeley Distribution