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| <title>Debugging with GDB: File Options</title> |
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| <a name="File-Options"></a> |
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| Next: <a href="Mode-Options.html#Mode-Options" accesskey="n" rel="next">Mode Options</a>, Up: <a href="Invoking-GDB.html#Invoking-GDB" accesskey="u" rel="up">Invoking GDB</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> |
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| <hr> |
| <a name="Choosing-Files"></a> |
| <h4 class="subsection">2.1.1 Choosing Files</h4> |
| |
| <p>When <small>GDB</small> starts, it reads any arguments other than options as |
| specifying an executable file and core file (or process ID). This is |
| the same as if the arguments were specified by the ‘<samp>-se</samp>’ and |
| ‘<samp>-c</samp>’ (or ‘<samp>-p</samp>’) options respectively. (<small>GDB</small> reads the |
| first argument that does not have an associated option flag as |
| equivalent to the ‘<samp>-se</samp>’ option followed by that argument; and the |
| second argument that does not have an associated option flag, if any, as |
| equivalent to the ‘<samp>-c</samp>’/‘<samp>-p</samp>’ option followed by that argument.) |
| If the second argument begins with a decimal digit, <small>GDB</small> will |
| first attempt to attach to it as a process, and if that fails, attempt |
| to open it as a corefile. If you have a corefile whose name begins with |
| a digit, you can prevent <small>GDB</small> from treating it as a pid by |
| prefixing it with <samp>./</samp>, e.g. <samp>./12345</samp>. |
| </p> |
| <p>If <small>GDB</small> has not been configured to included core file support, |
| such as for most embedded targets, then it will complain about a second |
| argument and ignore it. |
| </p> |
| <p>Many options have both long and short forms; both are shown in the |
| following list. <small>GDB</small> also recognizes the long forms if you truncate |
| them, so long as enough of the option is present to be unambiguous. |
| (If you prefer, you can flag option arguments with ‘<samp>--</samp>’ rather |
| than ‘<samp>-</samp>’, though we illustrate the more usual convention.) |
| </p> |
| |
| <dl compact="compact"> |
| <dt><code>-symbols <var>file</var></code></dt> |
| <dt><code>-s <var>file</var></code></dt> |
| <dd><a name="index-_002d_002dsymbols"></a> |
| <a name="index-_002ds"></a> |
| <p>Read symbol table from file <var>file</var>. |
| </p> |
| </dd> |
| <dt><code>-exec <var>file</var></code></dt> |
| <dt><code>-e <var>file</var></code></dt> |
| <dd><a name="index-_002d_002dexec"></a> |
| <a name="index-_002de"></a> |
| <p>Use file <var>file</var> as the executable file to execute when appropriate, |
| and for examining pure data in conjunction with a core dump. |
| </p> |
| </dd> |
| <dt><code>-se <var>file</var></code></dt> |
| <dd><a name="index-_002d_002dse"></a> |
| <p>Read symbol table from file <var>file</var> and use it as the executable |
| file. |
| </p> |
| </dd> |
| <dt><code>-core <var>file</var></code></dt> |
| <dt><code>-c <var>file</var></code></dt> |
| <dd><a name="index-_002d_002dcore"></a> |
| <a name="index-_002dc"></a> |
| <p>Use file <var>file</var> as a core dump to examine. |
| </p> |
| </dd> |
| <dt><code>-pid <var>number</var></code></dt> |
| <dt><code>-p <var>number</var></code></dt> |
| <dd><a name="index-_002d_002dpid"></a> |
| <a name="index-_002dp"></a> |
| <p>Connect to process ID <var>number</var>, as with the <code>attach</code> command. |
| </p> |
| </dd> |
| <dt><code>-command <var>file</var></code></dt> |
| <dt><code>-x <var>file</var></code></dt> |
| <dd><a name="index-_002d_002dcommand"></a> |
| <a name="index-_002dx"></a> |
| <p>Execute commands from file <var>file</var>. The contents of this file is |
| evaluated exactly as the <code>source</code> command would. |
| See <a href="Command-Files.html#Command-Files">Command files</a>. |
| </p> |
| </dd> |
| <dt><code>-eval-command <var>command</var></code></dt> |
| <dt><code>-ex <var>command</var></code></dt> |
| <dd><a name="index-_002d_002deval_002dcommand"></a> |
| <a name="index-_002dex"></a> |
| <p>Execute a single <small>GDB</small> command. |
| </p> |
| <p>This option may be used multiple times to call multiple commands. It may |
| also be interleaved with ‘<samp>-command</samp>’ as required. |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">gdb -ex 'target sim' -ex 'load' \ |
| -x setbreakpoints -ex 'run' a.out |
| </pre></div> |
| |
| </dd> |
| <dt><code>-init-command <var>file</var></code></dt> |
| <dt><code>-ix <var>file</var></code></dt> |
| <dd><a name="index-_002d_002dinit_002dcommand"></a> |
| <a name="index-_002dix"></a> |
| <p>Execute commands from file <var>file</var> before loading the inferior (but |
| after loading gdbinit files). |
| See <a href="Startup.html#Startup">Startup</a>. |
| </p> |
| </dd> |
| <dt><code>-init-eval-command <var>command</var></code></dt> |
| <dt><code>-iex <var>command</var></code></dt> |
| <dd><a name="index-_002d_002dinit_002deval_002dcommand"></a> |
| <a name="index-_002diex"></a> |
| <p>Execute a single <small>GDB</small> command before loading the inferior (but |
| after loading gdbinit files). |
| See <a href="Startup.html#Startup">Startup</a>. |
| </p> |
| </dd> |
| <dt><code>-directory <var>directory</var></code></dt> |
| <dt><code>-d <var>directory</var></code></dt> |
| <dd><a name="index-_002d_002ddirectory"></a> |
| <a name="index-_002dd"></a> |
| <p>Add <var>directory</var> to the path to search for source and script files. |
| </p> |
| </dd> |
| <dt><code>-r</code></dt> |
| <dt><code>-readnow</code></dt> |
| <dd><a name="index-_002d_002dreadnow"></a> |
| <a name="index-_002dr"></a> |
| <p>Read each symbol file’s entire symbol table immediately, rather than |
| the default, which is to read it incrementally as it is needed. |
| This makes startup slower, but makes future operations faster. |
| </p> |
| </dd> |
| </dl> |
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