manpagez: man pages & more
man ditroff(7)
Home | html | info | man
ditroff(7)                                                          ditroff(7)


       ditroff - classical device independent roff


       The name ditroff once marked a development level of the troff text pro-
       cessing system.  In actual roff(7) systems, the name troff is used as a
       synonym for ditroff.

       The  first roff system was written by Joe Ossanna around 1973.  It sup-
       ported only two output devices, the nroff program  produced  text  ori-
       ented  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 cre-
       ating 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 Ossanna'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 distinction between troff and ditroff isn't  necessary  any
       longer, for each modern troff provides already the complete functional-
       ity of ditroff.  On most systems, the name  troff  is  used  to  denote

       The  easiest  way  to  use  ditroff is the GNU roff system, groff.  The
       groff(1) program is a wrapper around (di)troff that automatically  han-
       dles postprocessing.


       [CSTR #54]
              The  1992  revision  of  the  Nroff/Troff User's Manual by J. F.
              Ossanna and Brian Kernighan, see Bell Labs CSTR #54

       [CSTR #97]
              A Typesetter-independent TROFF by Brian Kernighan is the  origi-
              nal documentation of the first multi-device troff (ditroff), see
              Bell Labs CSTR #97

              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

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


       Copyright (C) 2001-2014 Free Software Foundation, Inc.

       This file is part of groff, the GNU roff type-setting system.

       Permission  is  granted to copy, distribute and/or modify this document
       under the terms of the GNU Free Documentation License, Version  1.3  or
       any  later  version  published by the Free Software Foundation; with no
       Front-Cover Texts, and with no Back-Cover Texts.

       A copy of the Free Documentation License is included as a  file  called
       FDL  in  the  main  directory  of  the groff source package, it is also
       available on-line at the GNU copyleft site


       It was written by Bernd Warken and is maintained by Werner Lemberg

Groff Version 1.22.3            4 November 2014                     ditroff(7)

groff 1.22.3 - Generated Mon Oct 12 18:14:04 CDT 2015
© 2000-2024
Individual documents may contain additional copyright information.