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DITROFF(7) DITROFF(7)
NAME
ditroff - classical device independent roff
DESCRIPTION
The name ditroff once marked a development level of the troff text processing sys-
tem. 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 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 Osanna’s original
mono-device version, it was called ditroff (device independent troff) on some sys-
tems, 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. 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 documenta-
tion 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 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 AT mayn.de〉 and is maintained by Werner Lemberg 〈wl AT gnu.org〉.
Groff Version 1.18.1.1 19 February 2002 DITROFF(7)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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Under GNU General Public License
2008-11-22 05:02 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)