[thesh4d0w]

Maybe I'm missing something obvious here but on the one that asks you to get the proc's cmdline, how do the examples know it's pid 42?

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.

[Crespyl]

I haven't dug into the puzzle very far and it didn't seem to like my experiments, but in bash and zsh `$$` will expand to the shells PID.

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.