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COLCRT(1)		FreeBSD	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

NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | BUGS | HISTORY

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