Title: Good reference book, but...
Product review: This is really a good text book for beginners and reference book for regular users. You can learn 3 major shells in one book by lots of examples and lab exercirses. And find useful utilities quickly from the back of the book. But something are not so good about this book : 1. too many typos, wrong scripts, and results 2. some contexts should not appear over and over again (e.g., the "vendor") 3. some examples and lab exercises are used in all 3 shells, which are good for the beginners to learn the usages between difference shells. but they are not really very big differences between them.
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