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<p>by indirectly invoking it via <code><a href="page.php?w=env">env</a></code> or using the <code>ENVIRONMENT_VARIABLE=VALUE &lt;command&gt;</code> notation. A running program can access the values of environment variables for configuration purposes.</p>

<p><a href="page.php?w=Shell_script">Shell script</a>s and <a href="page.php?w=Batch_file">batch files</a> use environment variables to communicate data and preferences to <a href="page.php?w=child_process">child process</a>es. They can also be used to store temporary values for reference later</p><p>
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