# 2.11BSD#431 - /usr/man/cat1/colcrt.0

    COLCRT(1)	    UNIX Programmer's 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 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, effec-
         tively 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, how-
         ever.  The -2 option is useful for sending output to the
         line printer when the output contains superscripts and sub-
         scripts which would otherwise be invisible.

         A typical use of colcrt would be

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

    SEE ALSO
         nroff/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; 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 `|' over-
         struck 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.

    Printed 11/26/99	   May 7, 1986				1

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