Understanding the way UNIX works at the nuts and bolts level can be both challenging and rewarding, and there are several good books that will help guide you on your way. Perhaps the best is The Art of Unix Programming by Eric Raymond (Addison-Wesley, ISBN: 0-13-142901-9), which focuses on the philosophy behind UNIX and manages to mix in much about the command line.
O'Reilly's Unix CD Bookshelf (ISBN: 0-596-00392-7) contains seven highly respected books in one, although it retails for more than $120 as a result! That said, it is incomparable in its depth and breadth of coverage.
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