It's a fun game for those with the skills, but an instructional tool it is not.
Given a set of operations, can you get to state X?
Usually requires a lot of searching and/or expertise, however the solutions will break pretty easily depending on which shell you're using, etc. So doesn't really teach you anything aside from iterating over a set of all possible operation combinations.
I love showing this screenshot to people: https://imgur.com/a/ziHqJxB. I was having problems trying to create a jailed shell, so I decided to bind mount /bin. That of course was a bad idea. I gave up and rm -rf'd the mountpoint without unmounting it. The screenshot has the serial logs from after that :P.
I had a good time enjoying my stupidity.
shopt -s dotglob; for i in *; do echo -n "$i "; done
Getting stuck on #/oops_print_file_contents - the command times out. Not sure if I'm missing a better solution or perhaps the server is overloaded
The command I tried was (here protected with rot13):
zncsvyr sbbone < zl-qvffregngvba.gkg; rpub "${sbbone[@]}"
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A mild irritant is that the usual ^W (delete word to the left) instead closes tab in Firefox. Perhaps this could be prevented...?
For the ^W thing I'm not sure if it's possible to avoid it, I'll check it out.
Only way I can see to do this would be to echo /proc/* first to see what PID it is, guess it's 42, then go from there, but that violates the "do it in one command" rule at the beginning.
Edit: Oh, I see what you mean now. I think it's just that you're expected to see that there's only a handful of PIDs in /proc and just try them each.