https://blog.gongquiz.com/2022/05/15/linux-%ec%8b%9c%ec%8a%a4%ed%85%9c%ec%97%90-%ec%83%88%eb%a1%9c%ec%9a%b4-%ec%82%ac%ec%9a%a9%ec%9e%90%eb%a5%bc-%eb%93%b1%eb%a1%9d%ed%95%98%eb%a0%a4%ea%b3%a0-%ed%95%9c%eb%8b%a4-%ec%9c%a0%ec%a0%80-2/