<html lang="en"> <head> <title>Environment Variables - Untitled</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Untitled"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="System-Utilities.html#System-Utilities" title="System Utilities"> <link rel="prev" href="Process-ID-Information.html#Process-ID-Information" title="Process ID Information"> <link rel="next" href="Current-Working-Directory.html#Current-Working-Directory" title="Current Working Directory"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Environment-Variables"></a> <p> Next: <a rel="next" accesskey="n" href="Current-Working-Directory.html#Current-Working-Directory">Current Working Directory</a>, Previous: <a rel="previous" accesskey="p" href="Process-ID-Information.html#Process-ID-Information">Process ID Information</a>, Up: <a rel="up" accesskey="u" href="System-Utilities.html#System-Utilities">System Utilities</a> <hr> </div> <h3 class="section">34.7 Environment Variables</h3> <!-- sysdep.cc --> <p><a name="doc_002dgetenv"></a> <div class="defun"> — Built-in Function: <b>getenv</b> (<var>var</var>)<var><a name="index-getenv-2422"></a></var><br> <blockquote><p>Return the value of the environment variable <var>var</var>. For example, <pre class="example"> getenv ("PATH") </pre> <p class="noindent">returns a string containing the value of your path. </p></blockquote></div> <!-- sysdep.cc --> <p><a name="doc_002dputenv"></a> <div class="defun"> — Built-in Function: <b>putenv</b> (<var>var, value</var>)<var><a name="index-putenv-2423"></a></var><br> — Built-in Function: <b>setenv</b> (<var>var, value</var>)<var><a name="index-setenv-2424"></a></var><br> <blockquote><p>Set the value of the environment variable <var>var</var> to <var>value</var>. </p></blockquote></div> </body></html>