https://blog.gongquiz.com/2021/10/04/linux-%ec%8b%9c%ec%8a%a4%ed%85%9c%ec%97%90%ec%84%9c-%ec%83%81%ec%9c%84-%eb%94%94%eb%a0%89%ed%84%b0%eb%a6%ac%ec%97%90-%ec%9e%88%eb%8a%94-%e2%80%b2abc-txt%e2%80%b2-%ed%8c%8c%ec%9d%bc%ec%9d%84-%ed%99%88/