Provided by: groff_1.21-7_i386 bug

NAME

       ditroff - classical device independent roff

DESCRIPTION

       The  name  ditroff  once  marked  a development level of the troff text
       processing system.  In actual roff(7) systems, the name troff  is  used
       as a synonym for ditroff.

       The  first  roff  system  was  written  by Joe Ossanna around 1973.  It
       supported only two output devices,  the  nroff  program  produced  text
       oriented tty output, while the troff program generated graphical output
       for exactly one output device, the Wang Graphic Systems CAT typesetter.

       In 1979, Brian Kernighan rewrote  troff  to  support  more  devices  by
       creating  an  intermediate output format for troff that can be fed into
       postprocessor programs which actually do the printout  on  the  device.
       Kernighan's  version  marks what is known as classical troff today.  In
       order to distinguish it from Ossanna's original mono-device version, it
       was  called  ditroff (device independent troff) on some systems, though
       this naming isn't mentioned in the classical documentation.

       Today, any existing roff system is based  on  Kernighan's  multi-device
       troff.   The  distinction between troff and ditroff isn't necessary any
       longer,  for  each  modern  troff   provides   already   the   complete
       functionality  of  ditroff.  On most systems, the name troff is used to
       denote ditroff.

       The easiest way to use ditroff is the  GNU  roff  system,  groff.   The
       groff(1)  program  is  a  wrapper  around  (di)troff that automatically
       handles postprocessing.

SEE ALSO

       [CSTR #54]
              The 1992 revision of the Nroff/Troff  User's  Manual  by  J.  F.
              Ossanna  and  Brian  Kernighan,  see Bell Labs CSTR #54 <http://
              cm.bell-labs.com/cm/cs/cstr/54.ps.gz>.

       [CSTR #97]
              A  Typesetter-independent  TROFF  by  Brian  Kernighan  is   the
              original   documentation   of   the   first  multi-device  troff
              (ditroff), see Bell Labs CSTR  #97  <http://cm.bell-labs.com/cm/
              cs/cstr/97.ps.gz>.

       roff(7)
              This document gives details on the history and concepts of roff.

       troff(1)
              The actual implementation of ditroff.

       groff(1)
              The  GNU  roff  program and pointers to all documentation around
              groff.

       groff_out(5)
              The groff version of the intermediate output language, the basis
              for multi-devicing.

AUTHORS

       Copyright  (C)  2001,  2002,  2004,  2007,  2008,  2009  Free  Software
       Foundation, Inc.

       This document is distributed under the  terms  of  the  FDL  (GNU  Free
       Documentation  License) version 1.3 or later.  You should have received
       a copy of the FDL on your system, it is also available on-line  at  the
       GNU copyleft site <http://www.gnu.org/copyleft/fdl.html>.

       This  document  is  part  of  groff, the GNU roff distribution.  It was
       written by Bernd Warken <bwarken@mayn.de> and is maintained  by  Werner
       Lemberg <wl@gnu.org>.