ddd(1)								     GNU Tools								    ddd(1)

NAME

       ddd, xddd - The Data Display Debugger

SYNOPSIS

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

       but usually just

       ddd    program

DESCRIPTION

       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 version 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,

	 http://www.gnu.org/software/ddd/

OPTIONS

       These are the most important options used when starting DDD.  All options may be abbreviated, as  long  as  they  are  unambiguous;  single
       dashes may also be used.  DDD also understands 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 con-
       flicts with an X option, or with a DDD option listed here, use the `--debugger' option, below.

       --configuration
	      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 directory' 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 well.

       --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.

       --ladebug
	      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.

       --trace
	      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.

       --version
	      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.

SEE ALSO

       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. Pesch.

       Java Language Debugging, at http://java.sun.com/ (and its mirrors) in /products/jdk/1.1/debugging/

       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 Luetkehaus, Computer Science	Report	95-07,	Technische
       Universitaet Braunschweig, 1995.

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

       The DDD FTP site,

	 ftp://ftp.gnu.org/

       The DDD WWW page,

	 http://www.gnu.org/software/ddd/

       The DDD Mailing List,

	  ddd@gnu.org

       For more information on this list, send a mail to

	  ddd-request@gnu.org .

COPYRIGHT

       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 modi-
       fied 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)