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<a name="gdb_002eprompt"></a>
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<a name="gdb_002eprompt-1"></a>
<h4 class="subsubsection">23.2.4.3 gdb.prompt</h4>
<a name="index-gdb_002eprompt"></a>

<p>This module provides a method for prompt value-substitution.
</p>
<dl compact="compact">
<dt><code>substitute_prompt (<var>string</var>)</code></dt>
<dd><p>Return <var>string</var> with escape sequences substituted by values.  Some
escape sequences take arguments.  You can specify arguments inside
&ldquo;{}&rdquo; immediately following the escape sequence.
</p>
<p>The escape sequences you can pass to this function are:
</p>
<dl compact="compact">
<dt><code>\\</code></dt>
<dd><p>Substitute a backslash.
</p></dd>
<dt><code>\e</code></dt>
<dd><p>Substitute an ESC character.
</p></dd>
<dt><code>\f</code></dt>
<dd><p>Substitute the selected frame; an argument names a frame parameter.
</p></dd>
<dt><code>\n</code></dt>
<dd><p>Substitute a newline.
</p></dd>
<dt><code>\p</code></dt>
<dd><p>Substitute a parameter&rsquo;s value; the argument names the parameter.
</p></dd>
<dt><code>\r</code></dt>
<dd><p>Substitute a carriage return.
</p></dd>
<dt><code>\t</code></dt>
<dd><p>Substitute the selected thread; an argument names a thread parameter.
</p></dd>
<dt><code>\v</code></dt>
<dd><p>Substitute the version of GDB.
</p></dd>
<dt><code>\w</code></dt>
<dd><p>Substitute the current working directory.
</p></dd>
<dt><code>\[</code></dt>
<dd><p>Begin a sequence of non-printing characters.  These sequences are
typically used with the ESC character, and are not counted in the string
length.  Example: &ldquo;\[\e[0;34m\](gdb)\[\e[0m\]&rdquo; will return a
blue-colored &ldquo;(gdb)&rdquo; prompt where the length is five.
</p></dd>
<dt><code>\]</code></dt>
<dd><p>End a sequence of non-printing characters.
</p></dd>
</dl>

<p>For example:
</p>
<div class="smallexample">
<pre class="smallexample">substitute_prompt (&quot;frame: \f, args: \p{print frame-arguments}&quot;)
</pre></div>

<p>will return the string:
</p>
<div class="smallexample">
<pre class="smallexample">&quot;frame: main, args: scalars&quot;
</pre></div>
</dd>
</dl>


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