colcrt

 

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 COLCRT(1)               System General Commands Manual               COLCRT(1)
 
NAME
      colcrt - filter nroff output for CRT previewing
 
SYNOPSIS
      colcrt [-] [-2] [file ...]
 
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

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