(ddd.info)Invoking

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2.1 Invoking DDD
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Normally, you can run DDD by invoking the program `ddd'.

   You can also run DDD with a variety of arguments and options, to
specify more of your debugging environment at the outset.

   The most usual way to start DDD is with one argument, specifying an
executable program:

     ddd PROGRAM

If you use GDB, DBX, Ladebug, or XDB as inferior debuggers, you can also
start with both an executable program and a core file specified:

     ddd PROGRAM CORE

   You can, instead, specify a process ID as a second argument, if you
want to debug a running process:

     ddd PROGRAM 1234

would attach DDD to process `1234' (unless you also have a file named
`1234'; DDD does check for a core file first).

   You can further control DDD by invoking it with specific "options".
To get a list of DDD options, invoke DDD as

     ddd --help

   Most important are the options to specify the inferior debugger
(Note: Choosing an Inferior Debugger), but you can also customize
several aspects of DDD upon invocation (Note: Options).

   DDD also understands the usual X options such as `-display' or
`-geometry'.  Note: X Options, for details.

   All arguments and options that are not understood by DDD are passed
to the inferior debugger; Note: Inferior Debugger Options, for a
survey.  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 (Note: Options).

Choosing an Inferior Debugger

Which debugger to use?

Options

How to invoke DDD

X Options

Setting X properties

Inferior Debugger Options

Customizing GDB, DBX, and so on

Multiple Instances

Running multiple DDD instances

X Warnings

Turning off obnoxious warnings