I’d like to express my appreciation of all the hard work that’s gone into the preparation of this book by the people at No Starch Press, especially Keith Fancher, Serena Yang, and Bill Pollock. Thanks also to the copyeditor, Kim Wimpsett, and to the technical reviewer, Pat Eyler. For keeping me on the right side of sanity, I owe a debt of gratitude to my two dogs, Beryl and Seven, and to their beautiful mother, Bethan, who, to my enormous sadness, died while I was writing this book.