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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>System.Environment</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[
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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">haskell2010-1.1.0.1: Compatibility with Haskell 2010</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Safe Haskell</th><td>Safe</td></tr></table><p class="caption">System.Environment</p></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:getArgs">getArgs</a> :: <a href="Prelude.html#t:IO">IO</a> [<a href="Prelude.html#t:String">String</a>]</li><li class="src short"><a href="#v:getProgName">getProgName</a> :: <a href="Prelude.html#t:IO">IO</a> <a href="Prelude.html#t:String">String</a></li><li class="src short"><a href="#v:getEnv">getEnv</a> :: <a href="Prelude.html#t:String">String</a> -&gt; <a href="Prelude.html#t:IO">IO</a> <a href="Prelude.html#t:String">String</a></li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><a name="v:getArgs" class="def">getArgs</a> :: <a href="Prelude.html#t:IO">IO</a> [<a href="Prelude.html#t:String">String</a>]<a href="../base-4.5.1.0/src/System-Environment.html#getArgs" class="link">Source</a></p><div class="doc"><p>Computation <code><a href="System-Environment.html#v:getArgs">getArgs</a></code> returns a list of the program's command
 line arguments (not including the program name).
</p></div></div><div class="top"><p class="src"><a name="v:getProgName" class="def">getProgName</a> :: <a href="Prelude.html#t:IO">IO</a> <a href="Prelude.html#t:String">String</a><a href="../base-4.5.1.0/src/System-Environment.html#getProgName" class="link">Source</a></p><div class="doc"><p>Computation <code><a href="System-Environment.html#v:getProgName">getProgName</a></code> returns the name of the program as it was
invoked.
</p><p>However, this is hard-to-impossible to implement on some non-Unix
OSes, so instead, for maximum portability, we just return the leafname
of the program as invoked. Even then there are some differences
between platforms: on Windows, for example, a program invoked as foo
is probably really <code>FOO.EXE</code>, and that is what <code><a href="System-Environment.html#v:getProgName">getProgName</a></code> will return.
</p></div></div><div class="top"><p class="src"><a name="v:getEnv" class="def">getEnv</a> :: <a href="Prelude.html#t:String">String</a> -&gt; <a href="Prelude.html#t:IO">IO</a> <a href="Prelude.html#t:String">String</a><a href="../base-4.5.1.0/src/System-Environment.html#getEnv" class="link">Source</a></p><div class="doc"><p>Computation <code><a href="System-Environment.html#v:getEnv">getEnv</a></code> <code>var</code> returns the value
 of the environment variable <code>var</code>.  
</p><p>This computation may fail with:
</p><ul><li> <code><a href="../base-4.5.1.0/System-IO-Error.html#v:isDoesNotExistError">isDoesNotExistError</a></code> if the environment variable
    does not exist.
</li></ul></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>