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105 lines
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<title>Guile Commands - Debugging with GDB</title>
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<a name="Guile-Commands"></a>
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Next: <a rel="next" accesskey="n" href="Guile-API.html#Guile-API">Guile API</a>,
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Previous: <a rel="previous" accesskey="p" href="Guile-Introduction.html#Guile-Introduction">Guile Introduction</a>,
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<h4 class="subsection">23.3.2 Guile Commands</h4>
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<p><a name="index-guile-commands-2450"></a><a name="index-commands-to-access-guile-2451"></a>
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<span class="sc">gdb</span> provides two commands for accessing the Guile interpreter:
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<a name="index-guile_002drepl-2452"></a>
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<a name="index-gr-2453"></a>
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<dl><dt><code>guile-repl</code><dt><code>gr</code><dd>The <code>guile-repl</code> command can be used to start an interactive
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Guile prompt or <dfn>repl</dfn>. To return to <span class="sc">gdb</span>,
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type <kbd>,q</kbd> or the <code>EOF</code> character (e.g., <kbd>Ctrl-D</kbd> on
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an empty prompt). These commands do not take any arguments.
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<p><a name="index-guile-2454"></a><a name="index-gu-2455"></a><br><dt><code>guile </code><span class="roman">[</span><var>scheme-expression</var><span class="roman">]</span><dt><code>gu </code><span class="roman">[</span><var>scheme-expression</var><span class="roman">]</span><dd>The <code>guile</code> command can be used to evaluate a Scheme expression.
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<p>If given an argument, <span class="sc">gdb</span> will pass the argument to the Guile
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interpreter for evaluation.
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<pre class="smallexample"> (gdb) guile (display (+ 20 3)) (newline)
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23
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</pre>
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<p>The result of the Scheme expression is displayed using normal Guile rules.
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<pre class="smallexample"> (gdb) guile (+ 20 3)
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23
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</pre>
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<p>If you do not provide an argument to <code>guile</code>, it will act as a
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multi-line command, like <code>define</code>. In this case, the Guile
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script is made up of subsequent command lines, given after the
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<code>guile</code> command. This command list is terminated using a line
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containing <code>end</code>. For example:
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<pre class="smallexample"> (gdb) guile
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>(display 23)
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>(newline)
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>end
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23
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</pre>
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</dl>
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<p>It is also possible to execute a Guile script from the <span class="sc">gdb</span>
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interpreter:
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<dl>
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<dt><code>source </code><samp><span class="file">script-name</span></samp><dd>The script name must end with ‘<samp><span class="samp">.scm</span></samp>’ and <span class="sc">gdb</span> must be configured
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to recognize the script language based on filename extension using
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the <code>script-extension</code> setting. See <a href="Extending-GDB.html#Extending-GDB">Extending GDB</a>.
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<br><dt><code>guile (load "script-name")</code><dd>This method uses the <code>load</code> Guile function.
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It takes a string argument that is the name of the script to load.
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See the Guile documentation for a description of this function.
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(see <a href="../guile/Loading.html#Loading">Loading</a>).
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</dl>
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