https://purengom.com/2006/09/26/mac-os-x-%eb%b3%b5%ec%82%ac%ec%99%80-%ec%9d%b4%eb%8f%99%ec%9d%98-%ea%b0%9c%eb%85%90-%ec%83%9d%ea%b0%81%ed%95%98%ea%b8%b0/