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  <h3><a href="../contents.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Environment Variables</a><ul>
<li><a class="reference internal" href="#setting-environment-variables-in-linux-and-os-x">Setting environment variables in Linux and OS-X</a><ul>
<li><a class="reference internal" href="#bash-ksh">BASH/KSH</a></li>
<li><a class="reference internal" href="#csh-tcsh">CSH/TCSH</a></li>
</ul>
</li>
<li><a class="reference internal" href="#setting-environment-variables-in-windows">Setting environment variables in windows</a></li>
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  <div class="section" id="environment-variables">
<span id="id1"></span><h1>Environment Variables<a class="headerlink" href="#environment-variables" title="Permalink to this headline">¶</a></h1>
<div class="contents topic" id="contents">
<p class="topic-title first">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#environment-variables" id="id2">Environment Variables</a><ul>
<li><a class="reference internal" href="#setting-environment-variables-in-linux-and-os-x" id="id3">Setting environment variables in Linux and OS-X</a><ul>
<li><a class="reference internal" href="#bash-ksh" id="id4">BASH/KSH</a></li>
<li><a class="reference internal" href="#csh-tcsh" id="id5">CSH/TCSH</a></li>
</ul>
</li>
<li><a class="reference internal" href="#setting-environment-variables-in-windows" id="id6">Setting environment variables in windows</a></li>
</ul>
</li>
</ul>
</div>
<dl class="envvar">
<dt id="envvar-HOME">
<tt class="descname">HOME</tt><a class="headerlink" href="#envvar-HOME" title="Permalink to this definition">¶</a></dt>
<dd><p>The user&#8217;s home directory. On linux, <span class="target" id="index-0"></span><a class="reference internal" href="#envvar-HOME"><tt class="xref std std-envvar docutils literal"><span class="pre">~</span></tt></a> is shorthand for <span class="target" id="index-1"></span><a class="reference internal" href="#envvar-HOME"><tt class="xref std std-envvar docutils literal"><span class="pre">HOME</span></tt></a>.</p>
</dd></dl>

<dl class="envvar">
<dt id="envvar-PATH">
<tt class="descname">PATH</tt><a class="headerlink" href="#envvar-PATH" title="Permalink to this definition">¶</a></dt>
<dd><p>The list of directories searched to find executable programs</p>
</dd></dl>

<dl class="envvar">
<dt id="envvar-PYTHONPATH">
<tt class="descname">PYTHONPATH</tt><a class="headerlink" href="#envvar-PYTHONPATH" title="Permalink to this definition">¶</a></dt>
<dd><p>The list of directories that is added to Python&#8217;s standard search list when
importing packages and modules</p>
</dd></dl>

<dl class="envvar">
<dt id="envvar-MPLCONFIGDIR">
<tt class="descname">MPLCONFIGDIR</tt><a class="headerlink" href="#envvar-MPLCONFIGDIR" title="Permalink to this definition">¶</a></dt>
<dd><p>This is the directory used to store user customizations to matplotlib, as
well as some caches to improve performance. If <span class="target" id="index-2"></span><a class="reference internal" href="#envvar-MPLCONFIGDIR"><tt class="xref std std-envvar docutils literal"><span class="pre">MPLCONFIGDIR</span></tt></a> is not
defined, <tt class="file docutils literal"><em><span class="pre">HOME</span></em><span class="pre">/.matplotlib</span></tt> is used by default.</p>
</dd></dl>

<div class="section" id="setting-environment-variables-in-linux-and-os-x">
<span id="setting-linux-osx-environment-variables"></span><h2>Setting environment variables in Linux and OS-X<a class="headerlink" href="#setting-environment-variables-in-linux-and-os-x" title="Permalink to this headline">¶</a></h2>
<p>To list the current value of <span class="target" id="index-3"></span><a class="reference internal" href="#envvar-PYTHONPATH"><tt class="xref std std-envvar docutils literal"><span class="pre">PYTHONPATH</span></tt></a>, which may be empty, try:</p>
<div class="highlight-python"><pre>echo $PYTHONPATH</pre>
</div>
<p>The procedure for setting environment variables in depends on what your default
shell is. <strong class="program">BASH</strong> seems to be the most common, but <strong class="program">CSH</strong> is
also common. You should be able to determine which by running at the command
prompt:</p>
<div class="highlight-python"><pre>echo $SHELL</pre>
</div>
<div class="section" id="bash-ksh">
<h3>BASH/KSH<a class="headerlink" href="#bash-ksh" title="Permalink to this headline">¶</a></h3>
<p>To create a new environment variable:</p>
<div class="highlight-python"><pre>export PYTHONPATH=~/Python</pre>
</div>
<p>To prepend to an existing environment variable:</p>
<div class="highlight-python"><pre>export PATH=~/bin:${PATH}</pre>
</div>
<p>The search order may be important to you, do you want <tt class="file docutils literal"><span class="pre">~/bin</span></tt> to
be searched first or last? To append to an existing environment
variable:</p>
<div class="highlight-python"><pre>export PATH=${PATH}:~/bin</pre>
</div>
<p>To make your changes available in the future, add the commands to your
<tt class="file docutils literal"><span class="pre">~/.bashrc</span></tt> file.</p>
</div>
<div class="section" id="csh-tcsh">
<h3>CSH/TCSH<a class="headerlink" href="#csh-tcsh" title="Permalink to this headline">¶</a></h3>
<p>To create a new environment variable:</p>
<div class="highlight-python"><pre>setenv PYTHONPATH ~/Python</pre>
</div>
<p>To prepend to an existing environment variable:</p>
<div class="highlight-python"><pre>setenv PATH ~/bin:${PATH}</pre>
</div>
<p>The search order may be important to you, do you want <tt class="file docutils literal"><span class="pre">~/bin</span></tt> to be searched
first or last? To append to an existing environment variable:</p>
<div class="highlight-python"><pre>setenv PATH ${PATH}:~/bin</pre>
</div>
<p>To make your changes available in the future, add the commands to your
<tt class="file docutils literal"><span class="pre">~/.cshrc</span></tt> file.</p>
</div>
</div>
<div class="section" id="setting-environment-variables-in-windows">
<span id="setting-windows-environment-variables"></span><h2>Setting environment variables in windows<a class="headerlink" href="#setting-environment-variables-in-windows" title="Permalink to this headline">¶</a></h2>
<p>Open the <strong class="program">Control Panel</strong> (<em class="menuselection">Start ‣ Control Panel</em>),
start the <strong class="program">System</strong> program. Click the <em class="guilabel">Advanced</em> tab
and select the <em class="guilabel">Environment Variables</em> button. You can edit or add to
the <em class="guilabel">User Variables</em>.</p>
</div>
</div>


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