Level Goal
The password for the next level is stored in the file data.txt, which is a hexdump of a file that has been repeatedly compressed. For this level it may be useful to create a directory under /tmp in which you can work using mkdir. For example: mkdir /tmp/myname123. Then copy the datafile using cp, and rename it using mv (read the manpages!)
Commands you may need to solve this level
grep, sort, uniq, strings, base64, tr, tar, gzip, bzip2, xxd, mkdir, cp, mv
Helpful Reading Material
用xxd将hexdump转换为二进制文件后，用file确定二进制文件为gzip，尝试gzip -dv 却报错：gzip: data.txt: unknown suffix -- ignored。原因在于多次压缩的文件gzip直接解压后无法还原为非压缩文件。可以将标准输出定向到一个新的文件然后解压或者使用管道继续解压。