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 subscripts 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)