func Setsys(key, value string) error {
	if !_IS_ROOT {
		return ErrNoRoot
	}
	return _Set(_SETTINGS.global, key, value)
}
func Setsys(key, value string) error {
	if !_IS_ROOT {
		return ErrNoRoot
	}
	return _Set(_SETTINGS.global, key, value)
}
// == Set system-wide variables
// Setsys 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.