COLCRT(1)               GENIX Programmer's Manual               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 dash-
           ing `-') 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  dou-
           ble  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  super-
           scripts 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)

      AUTHOR
           William Joy

      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.









      Printed 11/16/83                                                        1