Title: As title said, it is practical
Product review: This is the book I always keep next to my terminal. It is more than an intro book, but don't expect it to be a teaching or step by step reference book. I have always use it to reference commands in vi editor, shell syntax, and all those general stuff that other reference guides either don't cover it or make too much out of it. Used it since 1997 and it will sure stay there for a long time.
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