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<a name="Environment-Variables"></a>
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<a name="Environment-Variables-1"></a>
<h3 class="section">36.7 Environment Variables</h3>
<a name="XREFgetenv"></a><dl>
<dt><a name="index-getenv"></a>Built-in Function: <em></em> <strong>getenv</strong> <em>(<var>var</var>)</em></dt>
<dd><p>Return the value of the environment variable <var>var</var>.
</p>
<p>For example,
</p>
<div class="example">
<pre class="example">getenv ("PATH")
</pre></div>
<p>returns a string containing the value of your path.
</p>
<p><strong>See also:</strong> <a href="#XREFsetenv">setenv</a>, <a href="#XREFunsetenv">unsetenv</a>.
</p></dd></dl>
<a name="XREFsetenv"></a><dl>
<dt><a name="index-setenv"></a>Built-in Function: <em></em> <strong>setenv</strong> <em>(<var>var</var>, <var>value</var>)</em></dt>
<dt><a name="index-setenv-1"></a>Built-in Function: <em></em> <strong>setenv</strong> <em>(<var>var</var>)</em></dt>
<dt><a name="index-putenv"></a>Built-in Function: <em></em> <strong>putenv</strong> <em>(…)</em></dt>
<dd><p>Set the value of the environment variable <var>var</var> to <var>value</var>.
</p>
<p>If no <var>value</var> is specified then the variable will be assigned the null
string.
</p>
<p><strong>See also:</strong> <a href="#XREFunsetenv">unsetenv</a>, <a href="#XREFgetenv">getenv</a>.
</p></dd></dl>
<a name="XREFunsetenv"></a><dl>
<dt><a name="index-unsetenv"></a>Built-in Function: <em><var>status</var> =</em> <strong>unsetenv</strong> <em>(<var>var</var>)</em></dt>
<dd><p>Delete the environment variable <var>var</var>.
</p>
<p>Return 0 if the variable was deleted, or did not exist, and -1 if an error
occurred.
</p>
<p><strong>See also:</strong> <a href="#XREFsetenv">setenv</a>, <a href="#XREFgetenv">getenv</a>.
</p></dd></dl>
<a name="XREFget_005fhome_005fdirectory"></a><dl>
<dt><a name="index-get_005fhome_005fdirectory"></a>Built-in Function: <em><var>homedir</var> =</em> <strong>get_home_directory</strong> <em>()</em></dt>
<dd><p>Return the current home directory.
</p>
<p>On most systems, this is equivalent to <code>getenv ("HOME")</code>. On Windows
systems, if the environment variable <code>HOME</code> is not set then it is
equivalent to
<code>fullfile (getenv ("HOMEDRIVE"), getenv ("HOMEPATH"))</code>
</p>
<p><strong>See also:</strong> <a href="#XREFgetenv">getenv</a>.
</p></dd></dl>
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