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Ed, I'm very sorry that the book disappointed you. However, I'd ask you to give it another chance, but be sure to think about the goals of the book that are spelled out on the back cover (see http://www.oreilly.com/catalog/lunixpanther/desc.html). I really do think we accomplished the goals that we set out to with this book, although it sounds like it's not what you were looking for. As far as the coverage of sudo, please see p12, 48, and 54-55, where we have a section on the command. I'm sorry that you missed that the first time through, but please do give this book another look. Or, if this just isn't the book for you, you may want to look at Mac OS X Panther for Unix Geeks, which will be out soon. This one goes a lot further than the Learning Unix book.