Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very poor quality

The book is written for new Unix users. It has many exercises for the reader to perform and answer questions. Unfortunately, answers to the exercises that are provided are frequently wrong or the answers don't match the original question. There is a companion website containing chapter summaries and online quizzes. I tried one of the online quizzes..there were 11 questions..the website incorrectly marked two of my answers as wrong. The high number of innacuracies and mistakes in the book make it unsuitable for newbies trying to learn unix. I am disappointed in the poor quality of this book. Oh well...