## DESCRIPTION

         Colcrt provides virtual half-line and reverse line feed sequences for
         terminals without such capability, and on which overstriking is destruc
         tive.  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 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.

## 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.

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