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COLCRT(1)			 User Commands			     COLCRT(1)

NAME
       colcrt -	filter nroff output for	CRT previewing

SYNOPSIS
       colcrt [options]	[file...]

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

OPTIONS
       -, --no-underlining
	      Suppress all underlining.	 This option is	especially useful  for
	      previewing allboxed tables from tbl(1).

       -2, --half-lines
	      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, --version
	      Display version information and exit.

       -h, --help
	      Display help text	and exit.

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.

       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.

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)

AVAILABILITY
       The  colcrt  command is part of the util-linux package and is available
       from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux			September 2011			     COLCRT(1)

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

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