


      COLCRT(1)                     (DWB)                     COLCRT(1)



      NAME
           colcrt - filter nroff output for CRT previewing

      SYNTAX
           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 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

      SEE ALSO
           nroff(1), col(1).
           In ROS Reference Manual, more(1), ul(1).

      BUGS
           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.








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