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ddd(1)				   GNU Tools				ddd(1)

       ddd - The Data Display Debugger

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

       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:

       · Start	your program, specifying anything that might affect its behav‐

       · Make your program stop on specified conditions.

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

       · 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

       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 avail‐
       able online via the DDD WWW page,


       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  conflicts
       with  an	 X option, or with a DDD option listed here, use the `--debug‐
       ger' 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 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 host‐
	      name.  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 host‐
	      name.  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 debug‐

	      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

       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

       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 Uni‐
       versitaet Braunschweig, 1995.

       DDD  –  ein  Debugger  mit  graphischer	Datendarstellung,  by Dorothea
       Luetkehaus, Diploma Thesis, 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 © 2001 Universitaet Passau, Germany and ©
       2001-2004 Free Software Foundation, Inc.

       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  man‐
       ual page into another language, under the above conditions for modified
       versions, except that this permission notice may be included in	trans‐
       lations	approved  by  the  Free	 Software Foundation instead of in the
       original English.

DDD 3.3.12			  2001-01-15				ddd(1)

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