https://www.youtube.com/watch?v=BUnb1PKKMBA
- env vars
- echo var
- set var?
piping:
- /challenge/run < something?
- echo PWN | /challenge/run
- echo PWN | /challenge/run > myflag
- echo PWN | /challenge/run | rev
- echo PWN | /challenge/run | rev > myflag
- /challenge/run <<< "PWN"
- cat <(/challenge/run)