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COLCRT(1)                   General Commands Manual                  COLCRT(1)



NAME
       colcrt - filter nroff output for a terminal lacking overstrike capabil-
       ity

SYNOPSIS
       colcrt [ - ] [ -2 ] [ filename ... ]

DESCRIPTION
       colcrt provides virtual half and reverse LINEFEED sequences for  termi-
       nals without such capability, and on which overstriking is destructive.
       Half LINEFEED characters and underlining (changed to dashing  `-')  are
       placed on new lines in between the normal output lines.

OPTIONS
       -      Suppress  all  underlining  --  especially useful for previewing
              allboxed tables from tbl(1).

       -2     Print all half LINEFEED characters, effectively  double  spacing
              the  output.   Normally,  a  minimal space output format is used
              which suppresses empty lines.  colcrt never suppresses two  con-
              secutive  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.

EXAMPLE
       A typical use of colcrt would be

              example% tbl exum2.n | nroff -ms | colcrt - | more

SEE ALSO
       col(1V), more(1), nroff(1), tbl(1), troff(1), ul(1)

BUGS
       Cannot 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  sub-
       scripts in documents which are already double-spaced.



                               9 September 1987                      COLCRT(1)