unsetenv

SETENV(3)		  Linux Programmer’s Manual		    SETENV(3)



NAME
       setenv - change or add an environment variable

SYNOPSIS
       #include <stdlib.h>

       int setenv(const char *name, const char *value, int overwrite);

       void unsetenv(const char *name);

DESCRIPTION
       The  setenv()  function adds the variable name to the environment 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 environ-
       ment.

RETURN VALUE
       The setenv() function returns zero on success,  or  -1  if  there  was
       insufficient space in the environment.

CONFORMING TO
       BSD 4.3

SEE ALSO
       clearenv(3), getenv(3), putenv(3), environ(5)




BSD				  1993-04-04			    SETENV(3)