<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Environment Variables (GNU Octave (version 5.1.0))</title> <meta name="description" content="Environment Variables (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Environment Variables (GNU Octave (version 5.1.0))"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="System-Utilities.html#System-Utilities" rel="up" title="System Utilities"> <link href="Current-Working-Directory.html#Current-Working-Directory" rel="next" title="Current Working Directory"> <link href="Process-ID-Information.html#Process-ID-Information" rel="prev" title="Process ID Information"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> <link rel="stylesheet" type="text/css" href="octave.css"> </head> <body lang="en"> <a name="Environment-Variables"></a> <div class="header"> <p> Next: <a href="Current-Working-Directory.html#Current-Working-Directory" accesskey="n" rel="next">Current Working Directory</a>, Previous: <a href="Process-ID-Information.html#Process-ID-Information" accesskey="p" rel="prev">Process ID Information</a>, Up: <a href="System-Utilities.html#System-Utilities" accesskey="u" rel="up">System Utilities</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> <hr> <a name="Environment-Variables-1"></a> <h3 class="section">36.7 Environment Variables</h3> <a name="XREFgetenv"></a><dl> <dt><a name="index-getenv"></a><em></em> <strong>getenv</strong> <em>(<var>var</var>)</em></dt> <dd><p>Return the value of the environment variable <var>var</var>. </p> <p>For example, </p> <div class="example"> <pre class="example">getenv ("PATH") </pre></div> <p>returns a string containing the value of your path. </p> <p><strong>See also:</strong> <a href="#XREFsetenv">setenv</a>, <a href="#XREFunsetenv">unsetenv</a>. </p></dd></dl> <a name="XREFsetenv"></a><dl> <dt><a name="index-setenv"></a><em></em> <strong>setenv</strong> <em>(<var>var</var>, <var>value</var>)</em></dt> <dt><a name="index-setenv-1"></a><em></em> <strong>setenv</strong> <em>(<var>var</var>)</em></dt> <dt><a name="index-putenv"></a><em></em> <strong>putenv</strong> <em>(…)</em></dt> <dd><p>Set the value of the environment variable <var>var</var> to <var>value</var>. </p> <p>If no <var>value</var> is specified then the variable will be assigned the null string. </p> <p><strong>See also:</strong> <a href="#XREFunsetenv">unsetenv</a>, <a href="#XREFgetenv">getenv</a>. </p></dd></dl> <a name="XREFunsetenv"></a><dl> <dt><a name="index-unsetenv"></a><em><var>status</var> =</em> <strong>unsetenv</strong> <em>(<var>var</var>)</em></dt> <dd><p>Delete the environment variable <var>var</var>. </p> <p>Return 0 if the variable was deleted, or did not exist, and -1 if an error occurred. </p> <p><strong>See also:</strong> <a href="#XREFsetenv">setenv</a>, <a href="#XREFgetenv">getenv</a>. </p></dd></dl> <a name="XREFget_005fhome_005fdirectory"></a><dl> <dt><a name="index-get_005fhome_005fdirectory"></a><em><var>homedir</var> =</em> <strong>get_home_directory</strong> <em>()</em></dt> <dd><p>Return the current home directory. </p> <p>On most systems, this is equivalent to <code>getenv ("HOME")</code>. On Windows systems, if the environment variable <code>HOME</code> is not set then it is equivalent to <code>fullfile (getenv ("HOMEDRIVE"), getenv ("HOMEPATH"))</code> </p> <p><strong>See also:</strong> <a href="#XREFgetenv">getenv</a>. </p></dd></dl> </body> </html>