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ddd(1)					    GNU Tools					   ddd(1)

       ddd, xddd - The Data Display Debugger

       ddd    [--help] [--gdb] [--dbx] [--ladebug] [--wdb] [--xdb] [--jdb] [--pydb] [--perl]
	      [--debugger name] [--[r]host [username@]hostname]] [--trace] [--version] [--config-
	      uration] [options...] [prog[core|procID]]

       but usually just

       ddd    program

       DDD is a graphical front-end for GDB and other command-line debuggers.  Using DDD, you can
       see what is going on "inside" another program while it executes--or what  another  program
       was doing at the moment it crashed.

       DDD  can  do four main kinds of things (plus other things in support of these) to help you
       catch bugs in the act:

       o Start your program, specifying anything that might affect its behavior.

       o Make your program stop on specified conditions.

       o Examine what has happened, when your program has stopped.

       o Change things in your program, so you can experiment with correcting the effects of  one
	 bug and go on to learn about another.

       "Classical" UNIX debuggers such as the GNU debugger (GDB) provide a command-line interface
       and a multitude of commands for these and other debugging purposes.  DDD is a  comfortable
       graphical  user interface around an inferior GDB, DBX, Ladebug, XDB, JDB, Python debugger,
       or Perl debugger.

       DDD is invoked with the shell command ddd.  You can open a program to  be  debugged  using
       `File->Open Program' (the `Open Program' item in the `File' menu.  You can get online help
       at any time using the `Help' menu; for the first steps, try `Help->What Now?'.	Quit  DDD
       using `File->Exit'.

       More  information  on DDD is contained in the DDD Manual.  You can read the text-only ver-
       sion in DDD (via `Help->DDD Reference') or in Emacs (as Info  file).   Full-fledged  HTML,
       PostScript, and PDF versions are available online via the DDD WWW page,


       These  are the most important options used when starting DDD.  All options may be abbrevi-
       ated, as long as they are unambiguous; single dashes may also be used.	DDD  also  under-
       stands the usual X options such as `-display' or `-geometry'; see X(1) for details.

       All arguments and options not handled by DDD are passed to the inferior debugger.  To pass
       an option to the inferior debugger that conflicts with an X option, or with a  DDD  option
       listed here, use the `--debugger' option, below.

	      Show the DDD configuration settings and exit.

       --dbx  Run the DBX debugger as inferior debugger.

       --debugger name
	      Invoke  the  inferior  debugger  name.  This is useful if you have several debugger
	      versions around, or if the inferior debugger cannot be  invoked  as  `gdb',  `dbx',
	      `xdb', `jdb', `pydb', or `perl' respectively.
	      This  option  can  also be used to pass options to the inferior debugger that would
	      otherwise conflict with DDD options.  For instance, to pass the option  `-d  direc-
	      tory' to XDB, use:

		ddd --debugger "xdb -d directory"

	      If  you  use the `--debugger' option, be sure that the type of inferior debugger is
	      specified as well.  That is, use one of  the  options  `--gdb',  `--dbx',  `--xdb',
	      `--jdb' `--pydb', or `--perl' (unless the default setting works fine).

       --gdb  Run the GDB debugger as inferior debugger.

       --help Give  a  list of frequently used options.  Show options of the inferior debugger as

       --host [username@]hostname
	      Invoke the inferior debugger directly on the remote host hostname.  If username  is
	      given and the `--login' option is not used, use username as remote user name.

       --jdb  Run JDB as inferior debugger.

	      Run Ladebug as inferior debugger.

       --perl Run Perl as inferior debugger.

       --pydb Run PYDB as inferior debugger.

       --rhost [username@]hostname
	      Run  the	inferior debugger interactively on the remote host hostname.  If username
	      is given and the `--login' option is not used, use username as remote user name.

	      Show the interaction between DDD and the inferior debugger on standard error.  This
	      is  useful  for  debugging DDD.  If `--trace' is not specified, this information is
	      written into `$HOME/.ddd/log', such that you can also do a post-mortem debugging.

	      Show the DDD version and exit.

       --wdb  Run the WDB debugger as inferior debugger.

       --xdb  Run XDB as inferior debugger.

       A full list of options, including important options of the inferior debugger, can be found
       in the DDD manual.

       X(1), gdb(1), dbx(1), wdb(1), xdb(1), perldebug(1)

       `ddd' entry in info.

       `gdb' entry in info.

       Debugging with DDD: User's Guide and Reference Manual, by Andreas Zeller.

       Using  GDB: A Guide to the GNU Source-Level Debugger, by Richard M. Stallman and Roland H.

       Java  Language  Debugging,  at  http://java.sun.com/   (and   its   mirrors)   in   /prod-

       The Python Language, at http://www.python.org/ and its mirrors.

       DDD--A Free Graphical Front-End for UNIX Debuggers, by Andreas Zeller and Dorothea Luetke-
       haus, Computer Science Report 95-07, Technische Universitaet Braunschweig, 1995.

       DDD - ein Debugger mit graphischer Datendarstellung, by Dorothea Luetkehaus, Diploma  The-
       sis, Technische Universitaet Braunschweig, 1994.

       The DDD FTP site,


       The DDD WWW page,


       The DDD Mailing List,


       For more information on this list, send a mail to

	  ddd-request@gnu.org .

       This manual page is Copyright (C) 2001 Universitaet Passau, Germany.

       Permission  is granted to make and distribute verbatim copies of this manual page provided
       the copyright notice and this permission notice are preserved on all copies.

       Permission is granted to copy and distribute modified versions of this manual  page  under
       the  conditions	for  verbatim copying, provided that the entire resulting derived work is
       distributed under the terms of a permission notice identical to this one.

       Permission is granted to copy and distribute translations of this manual page into another
       language,  under  the  above conditions for modified versions, except that this permission
       notice may be included in translations approved by the Free Software Foundation instead of
       in the original English.

DDD 3.3.1				    2001-01-15					   ddd(1)
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