https://blog.gongquiz.com/2021/05/05/%eb%8b%a4%eb%a5%b8-%ec%9a%b4%ec%98%81%ec%b2%b4%ec%a0%9c%ec%99%80-linux%ea%b0%80-%ea%b3%b5%ec%a1%b4%ed%95%98%eb%8a%94-%ed%95%98%eb%82%98%ec%9d%98-%ec%8b%9c%ec%8a%a4%ed%85%9c%ec%97%90%ec%84%9c-%eb%a9%80/