func SetsysForUid(id int, key, value string) error {
	if !_IS_ROOT {
		return ErrNoRoot
	}

	_settings, err := getSettingsForUid(id)
	if err != nil {
		return err
	}
	return _Set(_settings.global, key, value)
}
func SetsysForUid(id int, key, value string) error {
	if !_IS_ROOT {
		return ErrNoRoot
	}

	_settings, err := getSettingsForUid(id)
	if err != nil {
		return err
	}
	return _Set(_settings.global, key, value)
}
// SetsysForUid sets the value of the environment variable named by the key that
// affects the system as a whole. You must be Root.
// It returns an error, if any.