


ddd(1)                      GNU Tools                      ddd(1)


NAME
       ddd - 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  behav-
         ior.

       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



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ddd(1)                      GNU Tools                      ddd(1)


       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.


       --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  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.

       --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 host-
              name.   If  username  is  given  and the `--login' option is not
              used, use username as remote user name.



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ddd(1)                      GNU Tools                      ddd(1)


       --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 debug-
              ging.

       --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 Uni-
       versitaet 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/gnu/ddd


       The DDD WWW page,

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


       The DDD Mailing List,




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ddd(1)                      GNU Tools                      ddd(1)


          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 and
       (C) 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.































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