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128 lines
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<title>Startup - Debugging with GDB</title>
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<a name="Startup"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Mode-Options.html#Mode-Options">Mode Options</a>,
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Up: <a rel="up" accesskey="u" href="Invoking-GDB.html#Invoking-GDB">Invoking GDB</a>
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<h4 class="subsection">2.1.3 What <span class="sc">gdb</span> Does During Startup</h4>
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<p><a name="index-g_t_0040value_007bGDBN_007d-startup-57"></a>
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Here's the description of what <span class="sc">gdb</span> does during session startup:
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<ol type=1 start=1>
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<li>Sets up the command interpreter as specified by the command line
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(see <a href="Mode-Options.html#Mode-Options">interpreter</a>).
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<li><a name="index-init-file-58"></a>Reads the system-wide <dfn>init file</dfn> (if <samp><span class="option">--with-system-gdbinit</span></samp> was
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used when building <span class="sc">gdb</span>; see <a href="System_002dwide-configuration.html#System_002dwide-configuration">System-wide configuration and settings</a>) and executes all the commands in
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that file.
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<p><a name="Home-Directory-Init-File"></a><li>Reads the init file (if any) in your home directory<a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a> and executes all the commands in
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that file.
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<p><a name="Option-_002dinit_002deval_002dcommand"></a><li>Executes commands and command files specified by the ‘<samp><span class="samp">-iex</span></samp>’ and
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‘<samp><span class="samp">-ix</span></samp>’ options in their specified order. Usually you should use the
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‘<samp><span class="samp">-ex</span></samp>’ and ‘<samp><span class="samp">-x</span></samp>’ options instead, but this way you can apply
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settings before <span class="sc">gdb</span> init files get executed and before inferior
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gets loaded.
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<li>Processes command line options and operands.
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<p><a name="Init-File-in-the-Current-Directory-during-Startup"></a><li>Reads and executes the commands from init file (if any) in the current
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working directory as long as ‘<samp><span class="samp">set auto-load local-gdbinit</span></samp>’ is set to
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‘<samp><span class="samp">on</span></samp>’ (see <a href="Init-File-in-the-Current-Directory.html#Init-File-in-the-Current-Directory">Init File in the Current Directory</a>).
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This is only done if the current directory is
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different from your home directory. Thus, you can have more than one
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init file, one generic in your home directory, and another, specific
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to the program you are debugging, in the directory where you invoke
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<span class="sc">gdb</span>.
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<li>If the command line specified a program to debug, or a process to
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attach to, or a core file, <span class="sc">gdb</span> loads any auto-loaded
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scripts provided for the program or for its loaded shared libraries.
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See <a href="Auto_002dloading.html#Auto_002dloading">Auto-loading</a>.
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<p>If you wish to disable the auto-loading during startup,
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you must do something like the following:
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<pre class="smallexample"> $ gdb -iex "set auto-load python-scripts off" myprogram
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</pre>
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<p>Option ‘<samp><span class="samp">-ex</span></samp>’ does not work because the auto-loading is then turned
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off too late.
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<li>Executes commands and command files specified by the ‘<samp><span class="samp">-ex</span></samp>’ and
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‘<samp><span class="samp">-x</span></samp>’ options in their specified order. See <a href="Command-Files.html#Command-Files">Command Files</a>, for
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more details about <span class="sc">gdb</span> command files.
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<li>Reads the command history recorded in the <dfn>history file</dfn>.
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See <a href="Command-History.html#Command-History">Command History</a>, for more details about the command history and the
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files where <span class="sc">gdb</span> records it.
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</ol>
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<p>Init files use the same syntax as <dfn>command files</dfn> (see <a href="Command-Files.html#Command-Files">Command Files</a>) and are processed by <span class="sc">gdb</span> in the same way. The init
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file in your home directory can set options (such as ‘<samp><span class="samp">set
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complaints</span></samp>’) that affect subsequent processing of command line options
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and operands. Init files are not executed if you use the ‘<samp><span class="samp">-nx</span></samp>’
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option (see <a href="Mode-Options.html#Mode-Options">Choosing Modes</a>).
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<p>To display the list of init files loaded by gdb at startup, you
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can use <kbd>gdb --help</kbd>.
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<p><a name="index-init-file-name-59"></a><a name="index-g_t_0040file_007b_002egdbinit_007d-60"></a><a name="index-g_t_0040file_007bgdb_002eini_007d-61"></a>The <span class="sc">gdb</span> init files are normally called <samp><span class="file">.gdbinit</span></samp>.
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The DJGPP port of <span class="sc">gdb</span> uses the name <samp><span class="file">gdb.ini</span></samp>, due to
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the limitations of file names imposed by DOS filesystems. The Windows
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port of <span class="sc">gdb</span> uses the standard name, but if it finds a
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<samp><span class="file">gdb.ini</span></samp> file in your home directory, it warns you about that
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and suggests to rename the file to the standard name.
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<div class="footnote">
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<hr>
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<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> On
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DOS/Windows systems, the home directory is the one pointed to by the
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<code>HOME</code> environment variable.</p>
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<hr></div>
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