COLCRT(1)                  Commands and Applications                 COLCRT(1)

NAME

       colcrt - filter nroff output for CRT previewing

SYNOPSIS

       colcrt [ - ] [ -2 ] [ file ...  ]
       colcrt -V

DESCRIPTION

       Colcrt  provides  virtual half-line and reverse line feed sequences for
       terminals without such capability, and on  which  overstriking  is  de‐
       structive.   Half-line  characters  and underlining (changed to dashing
       `-') are placed on new lines in between the normal output lines.

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.

       -V     Prints version information and exits.

EXAMPLES

       A typical use of colcrt would be

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

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  sub‐
       scripts in documents which are already double-spaced.

HISTORY

       The colcrt command appeared in 3.0BSD.

ATTRIBUTIONS

       This  command was ported from FreeBSD source code for distribution with
       GNO/ME 2.0.6.

       This program contains material  from  the  ORCA/C  Run-Time  Libraries,
       copyright 1987-1998 by Byte Works, Inc.  Used with permission.

SEE ALSO

       col(1), more(1), nroff(1), troff(1), ul(1)



GNO                            January 22, 1998                      COLCRT(1)