4.3BSD - /usr/man/cat1/colcrt.0

COLCRT(1)                                                            COLCRT(1)


NAME
       colcrt - filter nroff output for CRT previewing

SYNOPSIS
       colcrt [ - ] [ -2 ] [ 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.

       The optional - suppresses all underlining.  It is especially useful for
       previewing allboxed tables from tbl(1).

       The  option  -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 con‐
       secutive 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

SEE ALSO
       nroff/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; if we did this, however, colcrt
       wouldn’t get rid of cu���d underlining completely.

       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.


3rd Berkeley Distribution         May 7, 1986                        COLCRT(1)