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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
       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)