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Title: Fine if you already know vi.
Review: I didn't find this reference any good UNTIL I knew vi well. It is OK for a quick look up to remember a command; but to learn something new or more than you already know forget it. I have a coffee mug with vi commands on it that is far more helpful. Because of this experience, I am reluctant to buy others in this series (e.g. Python Pocket Reference).
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