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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.  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

     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 subscripts in documents which are already double-

     The colcrt command appeared in 3.0BSD.

     The colcrt command is part of the util-linux-ng package and is available from ftp://ftp.ker-

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