Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very Bad Book!

I can't belive people can actually rate this book 5 stars. I'm not so sure they tried the exercises. There is so much mistake in the book, that it's rediculous. None of the exercises work, because of the fact that UNIX is case-sensitive and the author sometimes considered that and sometimes didn't. Bottom line is: THIS IS AN EXTREMELY BAD BOOK.