https://blog.faceutil.com/2017/03/19/teracopy-%ed%85%8c%eb%9d%bc-%ec%b9%b4%ed%94%bc-2-27-%ec%82%ac%ec%9a%a9%eb%b2%95-%eb%8c%80%ec%9a%a9%eb%9f%89-%ed%8c%8c%ec%9d%bc-%eb%b3%b5%ec%82%ac-%ec%86%8d%eb%8f%84-%ec%98%ac%eb%a6%ac%ea%b8%b0-d/