Time has come to finally write something of technical nature, not just another advice on how others should work to make me happy. So here is a cheatsheet for a tester who spends at least some of her time with nix console. For obvious reasons it wasn't my intention to cover everything, so please take it just as a memory refresher (or a source of ideas it you find it useful).
NB: It is assumed that as long as you understand what man is, you are fine (use it if my explanation is not enough).