Yes, most people know of them :-) I just felt like presenting them to people who might not know of them and their strengths. Why not present tools, although many know of them already? I think it is important to talk freely about any software, as there is always someone who might not know them. I appreciate this myself, and i am actually also new with *nix systems. If everyone had the same approach to information as you, i would not be a part of it.