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 environment.

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

       getenv(3), putenv(3), environ(5)

BSD                                               April 4, 1993                                        SETENV(3)