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
       destructive.   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
	      Output version information and exit.

       -h, --help
	      Output help and exit.

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  sub-
       scripts in documents which are already double-spaced.

HISTORY
       The colcrt command appeared in 3.0BSD.

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



util-linux			September 2011			     COLCRT(1)