colcrt man page on Archlinux

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COLCRT(1)			 User Commands			     COLCRT(1)

       colcrt - filter nroff output for CRT previewing

       colcrt [options] [file ...]

       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.

       -, --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.

       A typical use of colcrt would be

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

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

       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.

       The colcrt command appeared in 3.0BSD.

       The  colcrt  command is part of the util-linux package and is available
       from Linux Kernel  Archive  ⟨

util-linux			September 2011			     COLCRT(1)

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