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COLCRT(1)		  BSD General Commands Manual		     COLCRT(1)

     colcrt - filter nroff output for CRT previewing

     colcrt [-] [-2] [file ...]

     The colcrt utility provides virtual half-line and reverse line feed
     sequences for terminals without such capability, and on which overstrik
     ing is destructive.  Half-line characters and underlining (changed to
     dashing -) are placed on new lines in between the normal output lines.

     The following options are available:

     -	     Suppress all underlining.	This option is especially useful for
	     previewing allboxed tables from tbl(1).

     -2      Cause 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.

     A typical use of colcrt would be

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

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

     Should fold underlines onto blanks even with the - option so that a
     true underline character would show.

     Cant 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.

     The colcrt command appeared in 3.0BSD.

BSD				 June 30, 1993				   BSD

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