Please consider donating to the authour of the book if you can afford to. The book is really good.
My own book.. Though not too good but might be useful.
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Go and grab your copy of the free ebook.
Quite nice book with small little hacks but sometimes the details are too much, specially the one on the cd command. I think there was no need for 3-4 examples of the same thing, but then nice collection and nice ebook.