Rating: 

I love O'Reilly books. But this one, put simple, is a bit of a dud. If you are expecting the kind of quality you may have found in other Nutshell books (Unix in Nutshell for instance), you aren't going to get it.

Looking for a quick reminder of some weird syntax? You probably won't find it.
Looking for some good little examples of commands you havn't used yet? You won't find them.
Looking for any hint of style, humor, or insight? You won't get that either.
Looking for exhaustive lists of all the options of a particular module? Nope.
Looking for an attractive and seldom used paperweight? Here it is.