setenv

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 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.

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)