By now (and by the time you read it) a lot of things changed, and even the way to call Maven 2 has changed compared to the way the book describes.

The "m2" command is there, but deprecated.
So I guess everybody has to stick to the Maven web site so far, as the book mentions.
And both its authors and other people (like me, who worked with Maven for 2 years now and did several presentations on it) think about new editions and books that should help you with Maven 2...