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gditroff (7)
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NAME
ditroff - classical device independent roff
DESCRIPTION
The name
ditroff
once marked a development level of the
troff
text processing system.
#include <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
(d/evice~i/ndependent~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. Osanna
and
Brian Kernighan,
see
[CSTR~#97]
A Typesetter-independent TROFF
by
Brian Kernighan
is the original documentation of the first multi-device troff
(ditroff/),
see
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
This document is part of
groff,
the GNU roff distribution.
It was written by
and is maintained by
