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<title>mod_env - Apache HTTP Server Version 2.2</title>
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<p class="apache">Apache HTTP Server Version 2.2</p>
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<div class="retired"><h4>Please note</h4>
<p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p>
<p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_env.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_env</h1>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Modifies the environment which is passed to CGI scripts and
SSI pages</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>env_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_env.c</td></tr></table>
<h3>Summary</h3>
<p>This module allows for control of internal environment variables that
are used by various Apache HTTP Server modules. These variables are also
provided to CGI scripts as native system environment variables, and available
for use in SSI pages. Environment variables may be passed from the shell
which invoked the <code class="program"><a href="../programs/httpd.html">httpd</a></code> process. Alternatively,
environment variables may be set or unset within the configuration process.</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#passenv">PassEnv</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#setenv">SetEnv</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#unsetenv">UnsetEnv</a></li>
</ul>
<h3>See also</h3>
<ul class="seealso">
<li><a href="../env.html">Environment Variables</a></li>
<li><code class="directive"><a href="../mod/mod_setenvif.html#setenvif">SetEnvIf</a></code></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="PassEnv" id="PassEnv">PassEnv</a> <a name="passenv" id="passenv">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Passes environment variables from the shell</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PassEnv <var>env-variable</var> [<var>env-variable</var>]
...</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_env</td></tr>
</table>
<p>Specifies one or more native system environment variables to make available
as internal environment variables, which are available to Apache HTTP Server modules
as well as propagated to CGI scripts and SSI pages. Values come from the
native OS environment of the shell which invoked the
<code class="program"><a href="../programs/httpd.html">httpd</a></code> process.</p>
<div class="example"><h3>Example</h3><p><code>
PassEnv LD_LIBRARY_PATH
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="SetEnv" id="SetEnv">SetEnv</a> <a name="setenv" id="setenv">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnv <var>env-variable</var> [<var>value</var>]</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_env</td></tr>
</table>
<p>Sets an internal environment variable, which is then available to Apache
HTTP Server modules, and passed on to CGI scripts and SSI pages.</p>
<div class="example"><h3>Example</h3><p><code>
SetEnv SPECIAL_PATH /foo/bin
</code></p></div>
<p> If you omit the <var>value</var> argument, the variable is set to
an empty string.</p>
<div class="note"><p>The internal environment variables set by this directive are set
<em>after</em> most early request processing directives are run, such as access
control and URI-to-filename mapping. If the environment variable you're
setting is meant as input into this early phase of processing such as the
<code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> directive, you should
instead set the environment variable with
<code class="directive"><a href="../mod/mod_setenvif.html#setenvif">SetEnvIf</a></code>.</p>
</div>
<div class="note"><p>On 2.2, the PATH environment variable cannot be set using Setenv.</p>
</div>
<h3>See also</h3>
<ul>
<li><a href="../env.html">Environment Variables</a></li>
</ul>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="UnsetEnv" id="UnsetEnv">UnsetEnv</a> <a name="unsetenv" id="unsetenv">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Removes variables from the environment</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>UnsetEnv <var>env-variable</var> [<var>env-variable</var>]
...</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_env</td></tr>
</table>
<p>Removes one or more internal environment variables from those passed
on to CGI scripts and SSI pages.</p>
<div class="example"><h3>Example</h3><p><code>
UnsetEnv LD_LIBRARY_PATH
</code></p></div>
</div>
</div>
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