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DITROFF


Section: Environments, Tables, and Troff Macros (7)
Updated: 19 February 2002
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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.
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

(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

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

This document is part of
groff,

the GNU roff distribution.
It was written by

and is maintained by



 

Index



NAME

DESCRIPTION

SEE ALSO

AUTHORS



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