Instruct: Classify Amazon reviews into positive or negative sentiment
Query: shallow, occasionally useful

Sometimes I find something useful in this book, but most the time it just sits on my shelf while I look things up online. I bought this because I wanted to make the transition from Linux user to Solaris user. In penguin-speak, this author did a --help on a bunch of commands and put them together in hard copy.If you think 1.5 pages on syslogd is something useful then buy this book. If you're a newbie then avoid this one completely.