func MSetsys(keys, values []string) error {
	if !_IS_ROOT {
		return ErrNoRoot
	}
	return _MSet(_SETTINGS.global, keys, values)
}
func MSetsys(keys, values []string) error {
	if !_IS_ROOT {
		return ErrNoRoot
	}
	return _MSet(_SETTINGS.global, keys, values)
}
// MSetsys sets multiple values of the environment variables named by the keys
// that affects the system as a whole. You must be Root.
// It returns an error, if any.