Instruct: Classify Amazon reviews into positive or negative sentiment
Query: definitely NOT a good book!

I don't think this is a good book. I have compared this book with other shell programming books and and found this book is not good at all. So when I need to refer a shell script book I would not use this one. Besieds, the author is really careless, this book contains a lot of errors.when I wrote this review, I found there are altogether 14 reviews already. Seems some of the reviewers had the same feeling toward this book as me.