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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
     The colcrt	utility	provides virtual half-line and reverse line feed
     sequences for terminals without such capability, and on which overstrik-
     ing is destructive.  Half-line characters and underlining (changed	to
     dashing `-') are placed on	new lines in between the normal	output lines.

     The following options are available:

     -	     Suppress all underlining.	This option is especially useful for
	     previewing	allboxed tables	from tbl(1).

     -2	     Cause 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.

ENVIRONMENT
     The LANG, LC_ALL and LC_CTYPE environment variables affect	the execution
     of	colcrt as described in environ(7).

EXIT STATUS
     The colcrt	utility	exits 0	on success, and	>0 if an error occurs.

EXAMPLES
     A typical use of colcrt would be

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

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

HISTORY
     The colcrt	command	appeared in 3.0BSD.

BUGS
     Should fold underlines onto blanks	even with the `-' option so that a
     true underline character would show.

     Cannot 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.

     Characters	that take up more than one column position may not be under-
     lined correctly.

FreeBSD	10.1			 July 31, 2004			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | EXIT STATUS | EXAMPLES | SEE ALSO | HISTORY | BUGS

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