It's a nice reference,
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This review is from: vi Editor Pocket Reference (Pocket Reference (O'Reilly)) (Paperback)
VI is the worst editor around. Period. Having said that, this nice little book is you companion in making things better. You will learn to make do with vi, which i effect is a kind of Swiss Army knife editor. It can do tremendous things, for a small and silly editor.
This book eases down the terrible way in which vi switches back between editing mode and beep-mode.
After reading the book I got hooked to jed, joe and nano.