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DITROFF(7)									       DITROFF(7)

       ditroff - classical device independent roff

       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 Osanna around 1973.  It supported only two output
       devices, the nroff program produced text oriented tty output, while the troff program gen-
       erated graphical output for exactly one output device, the Wang Graphic Systems CAT  type-

       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 Osanna'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  distinc-
       tion  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.

       [CSTR #54]
	      The 1992 revision of the Nroff/Troff User's  Manual  by  J.  F.  Osanna  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>.

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

	      The actual implementation of ditroff.

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

	      The groff version of the intermediate output language, the basis	for  multi-devic-

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

       This  document  is distributed under the terms of the FDL (GNU Free Documentation License)
       version 1.1 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>.

Groff Version 1.19.2			 February 6, 2006			       DITROFF(7)
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