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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">unix-2.5.1.1: POSIX functionality</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>non-portable (requires POSIX)</td></tr><tr><th>Stability</th><td>provisional</td></tr><tr><th>Maintainer</th><td>libraries@haskell.org</td></tr><tr><th>Safe Haskell</th><td>Trustworthy</td></tr></table><p class="caption">System.Posix.Env</p></div><div id="description"><p class="caption">Description</p><div class="doc"><p>POSIX environment support
</p></div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><a href="#v:getEnv">getEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> (<a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a>)</li><li class="src short"><a href="#v:getEnvDefault">getEnvDefault</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></li><li class="src short"><a href="#v:getEnvironmentPrim">getEnvironmentPrim</a> :: <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> [<a href="../base-4.5.1.0/Data-String.html#t:String">String</a>]</li><li class="src short"><a href="#v:getEnvironment">getEnvironment</a> :: <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> [(<a href="../base-4.5.1.0/Data-String.html#t:String">String</a>, <a href="../base-4.5.1.0/Data-String.html#t:String">String</a>)]</li><li class="src short"><a href="#v:putEnv">putEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</li><li class="src short"><a href="#v:setEnv">setEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/Data-Bool.html#t:Bool">Bool</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</li><li class="src short"><a href="#v:unsetEnv">unsetEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><a name="v:getEnv" class="def">getEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> (<a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a>)</p><div class="doc"><p><code><a href="System-Posix-Env.html#v:getEnv">getEnv</a></code> looks up a variable in the environment.
</p></div></div><div class="top"><p class="src"><a name="v:getEnvDefault" class="def">getEnvDefault</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></p><div class="doc"><p><code><a href="System-Posix-Env.html#v:getEnvDefault">getEnvDefault</a></code> is a wrapper around <code><a href="System-Posix-Env.html#v:getEnv">getEnv</a></code> where the
 programmer can specify a fallback if the variable is not found
 in the environment.
</p></div></div><div class="top"><p class="src"><a name="v:getEnvironmentPrim" class="def">getEnvironmentPrim</a> :: <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> [<a href="../base-4.5.1.0/Data-String.html#t:String">String</a>]</p></div><div class="top"><p class="src"><a name="v:getEnvironment" class="def">getEnvironment</a> :: <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> [(<a href="../base-4.5.1.0/Data-String.html#t:String">String</a>, <a href="../base-4.5.1.0/Data-String.html#t:String">String</a>)]</p><div class="doc"><p><code><a href="System-Posix-Env.html#v:getEnvironment">getEnvironment</a></code> retrieves the entire environment as a
 list of <code>(key,value)</code> pairs.
</p></div></div><div class="top"><p class="src"><a name="v:putEnv" class="def">putEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</p><div class="doc"><p><code><a href="System-Posix-Env.html#v:putEnv">putEnv</a></code> function takes an argument of the form <code>name=value</code>
 and is equivalent to <code>setEnv(key,value,True{-overwrite-})</code>.
</p></div></div><div class="top"><p class="src"><a name="v:setEnv" class="def">setEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/Data-Bool.html#t:Bool">Bool</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</p><div class="doc"><p>The <code><a href="System-Posix-Env.html#v:setEnv">setEnv</a></code> function inserts or resets the environment variable name in
     the current environment list.  If the variable <code>name</code> does not exist in the
     list, it is inserted with the given value.  If the variable does exist,
     the argument <code>overwrite</code> is tested; if <code>overwrite</code> is <code>False</code>, the variable is
     not reset, otherwise it is reset to the given value.
</p></div></div><div class="top"><p class="src"><a name="v:unsetEnv" class="def">unsetEnv</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</p><div class="doc"><p>The <code><a href="System-Posix-Env.html#v:unsetEnv">unsetEnv</a></code> function deletes all instances of the variable name
 from the environment.
</p></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.11.0</p></div></body></html>