Best linux books

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http://ubuntuforums.org – Hey, I have been searching over the net for some good Linux books, and have got a few names. Please can we pass pdf's/soft copies of some good Linux books here. I'm interested mainly in : 1)Linux File System 2)Bash 3)Programming in Linux 4)System calls 5)Signals, Interrupts 6)Something from an OS approach 7)For the dummies kind of approach No interested(yet) in : 1)Kernel 2)Shell scripting 3)Linux Commands 4)Device Drivers 5)System Administration 6)Linux hacks 7)Network Programming 8 )Socket Programming Thanks. :) PS : Would be great if you could post soft copies/links to soft copies here. (Hardware)