I've just started working at a summer internship where i'll be doing work solely on a linux cluster. Problem is, I know close to nothing about linux. So my boss told me to learn Linux...fast. I know there's a whole bunch of stuff online and off that I can access to find anything i need pretty much, but what's the most concise and quick site or book I can get that will quickly bring me up to speed on everything linux? On the "computer knowledge" side of things, i'm pretty comfortable with windows, and have done a bunch of C and C++ in terms of programming, so I can pick up on similar stuff quickly. Thanks for any info you guys may have.