5 30 Jan 2007 -- converted to use .SY/.OP./.YS.
7 This file is part of groff, the GNU roff type-setting system.
9 Copyright (C) 2001, 2002, 2004, 2007 Free Software Foundation, Inc.
10 written by Bernd Warken <bwarken@mayn.de>
11 maintained by Werner Lemberg <wl@gnu.org>
13 Permission is granted to copy, distribute and/or modify this document
14 under the terms of the GNU Free Documentation License, Version 1.1 or
15 any later version published by the Free Software Foundation; with the
16 Invariant Sections being this .ig-section and AUTHORS, with no
17 Front-Cover Texts, and with no Back-Cover Texts.
19 A copy of the Free Documentation License is included as a file called
20 FDL in the main directory of the groff source package.
24 .\" --------------------------------------------------------------------
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28 .TH DITROFF @MAN7EXT@ "@MDATE@" "Groff Version @VERSION@"
32 ditroff \- classical device independent roff
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41 once marked a development level of the
43 text processing system.
49 is used as a synonym for
53 The first roff system was written by Joe Osanna around 1973.
55 It supported only two output devices, the
57 program produced text oriented tty output, while the
59 program generated graphical output for exactly one output device, the Wang
60 .I Graphic Systems CAT
64 In 1979, Brian Kernighan rewrote troff to support more devices by
65 creating an intermediate output format for troff that can be fed into
66 postprocessor programs which actually do the printout on the device.
68 Kernighan's version marks what is known as
72 In order to distinguish it from Osanna's original mono-device version,
76 .IR d\/ "evice " i\/ "ndependent " troff\/\c
78 on some systems, though this naming isn't mentioned in the classical
82 Today, any existing roff system is based on Kernighan's multi-device
85 The distinction between
89 isn't necessary any longer, for each modern
91 provides already the complete functionality of
94 On most systems, the name
100 The easiest way to use ditroff is the GNU roff system,
103 .BR groff (@MAN1EXT@)
104 program is a wrapper around
106 that automatically handles postprocessing.
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115 The 1992 revision of the
116 .I Nroff/Troff User's Manual
120 .IR "Brian Kernighan" ,
122 .UR http://\:cm.bell-labs.com/\:cm/\:cs/\:cstr/\:54.ps.gz
128 .I A Typesetter-independent TROFF
131 is the original documentation of the first multi-device troff
134 .UR http://\:cm.bell-labs.com/\:cm/\:cs/\:cstr/\:97.ps.gz
140 This document gives details on the history and concepts of roff.
143 .BR @g@troff (@MAN1EXT@)
144 The actual implementation of
148 .BR groff (@MAN1EXT@)
149 The GNU roff program and pointers to all documentation around groff.
152 .BR groff_out (@MAN5EXT@)
153 The groff version of the intermediate output language, the basis for
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161 Copyright (C) 2001, 2002, 2004, 2007 Free Software Foundation, Inc.
164 This document is distributed under the terms of the FDL (GNU Free
165 Documentation License) version 1.1 or later.
167 You should have received a copy of the FDL on your system, it is also
168 available on-line at the
169 .UR http://\:www.gnu.org/\:copyleft/\:fdl.html
174 This document is part of
176 the GNU roff distribution.
179 .MT bwarken@\:mayn.de
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