Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not a tutorial, but ONE HELL OF A REFERENCE!

It is not in any way a tutorial, but a supplement that is a MUST HAVE. It is like having all the "man" pages and more laid out for you. It covers most of the common command line commands with the proper syntaxes. For those serious about learning the OS from the ground up, make this book the second book you buy (tutorial/installation guide being first). I promise this book will stay in use next to your computer. The only fault this book has is that it could use a few more examples.