COLCRT(1)                  Commands and Applications                 COLCRT(1)


       colcrt - filter nroff output for CRT previewing


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


       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.


       -      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.


       A typical use of colcrt would be

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


       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.


       The colcrt command appeared in 3.0BSD.


       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.


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

GNO                            January 22, 1998                      COLCRT(1)

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