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+<TITLE>setenv</TITLE>
+<body bgcolor="#ffffcc">
+<hr>
+<pre>
+
+
+
+<h3>SETENV(3) Linux Programmer's Manual SETENV(3)
+</h3>
+
+<h3>NAME
+</h3> setenv - change or add an environment variable
+
+<h3>SYNOPSIS
+</h3> #include &lt;stdlib.h&gt;
+
+ int setenv(const char *name, const char *value, int overwrite);
+
+ void unsetenv(const char *name);
+
+<h3>DESCRIPTION
+</h3> The setenv() function adds the variable name to the envi-
+ ronment with the value value, if name does not already
+ exist. If name does exist in the environment, then its
+ value is changed to value if overwrite is non-zero; if
+ overwrite is zero, then the value of name is not changed.
+
+ The unsetenv() function deletes the variable name from the
+ environment.
+
+<h3>RETURN VALUE
+</h3> The setenv() function returns zero on success, or -1 if
+ there was insufficient space in the environment.
+
+<h3>CONFORMING TO
+</h3> BSD 4.3
+
+</pre>
+<hr>
+<h3>SEE ALSO
+</h3><p>
+<a href=getenv.htm>getenv</a>,
+<a href=putenv.htm>putenv</a>,
+<pre>
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+<h3>BSD April 4, 1993 1
+</h3>
+
+ </pre>
+<P>
+<hr>
+<p>
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