While googling for Linux comparings to the old but trusted DOS - commands I hit the next url.
It's a really good guide for Linux-newbies to understand this OS.
As I had some problems to understand the structure of Linux, ' cause I always compared it with DOS, I think this one could give a good insight.

Unless there are some pretty good tut's made by some members here, I'd like to put this one
parallel to those tuts.

Hope you enjoy it !

http://tille.soti.org/training/tldp/

Greetz,