It's a great idea. But the execution fails rather badly. For starters, there are too many typos. But worse, there is an abominable number of errors, both of omission and commission, within the various tool descriptions. Examples are wrong.
Some explanations are unclear.
Comments come out of nowhere, leaving one to wonder what one missed. This should have been a great book, but I would be afraid to trust it on anything. It begins with a brief overview of how unix processes work, but rapidly proceeds to a very deep level. It's a bit dry, but it is, after all, a textbook covering complex material. Lots of diagrams and code fragments are included to make that material as easy to digest as possible.