Here are some kinds of cmd can use to leak content of files:
* file viewer (`more`)* compress/decompress cmd (`xz`, `tar`, `bzip2`)* Language interpreter/assembler (`perl`, `as` )
[see more](http://taqini.space/2020/04/20/WPICTF-2020-pwn-linux-wp/#Suckmore-Shell-2-0-200pt)