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NAME
     ddd, xddd - The Data Display Debugger


SYNOPSIS
     ddd  [--help] [--gdb] [--dbx] [--ladebug] [--xdb] [--jdb]
          [--pydb] [--perl] [--debugger name] [--[r]host
          username@]hostname]] [--trace] [--version] [--confi-
          guration] [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  comfort-
     able  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 Refer-
     ence') 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 unambi-
     guous; 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 `--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 set-
          ting 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 debug-
          ging DDD.  If `--trace' is not specified, this informa-
          tion  is  written  into `$HOME/.ddd/log', such that you
          can also do a post-mortem debugging.

     --version
          Show the DDD version and exit.

     --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), 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  mir-
     rors.


     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 O  1999  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  ver-
     sions  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 con-
     ditions 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.

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