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<TITLE>unsetenv</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 <stdlib.h>
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>
<h3>BSD April 4, 1993 1
</h3>
</pre>
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