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

     colcrt -- filter nroff output for CRT previewing

     colcrt [-] [-2] [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.

     Available options:

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

     -2      Causes all half-lines to be printed, effectively double spacing the output.  Nor-
	     mally, 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

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

     Should fold underlines onto blanks even with the '-' option so that a true underline charac-
     ter 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.

     The colcrt command appeared in 3.0BSD.

3rd Berkeley Distribution		  June 30, 1993 		3rd Berkeley Distribution
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