Without overwhelming the reader, this reference is packed with information in a clear, practical, easy-to-understand form for the end-user that quickly explains all essential UNIX commands and procedures.
There is much more to this book than just beginning UNIX commands. There are dozens of beginning UNIX books. Many of them are quite good.
This book however is one of the few that can start with the concepts and get you going on most of the major UNIX platforms.
Yes, everyone will point out the differences between BSD and AT&T, however, most systems are a combination. What I found interesting is the X Window information as the general public does not realize that UNIX has a GUI interface like CDE.
This book also has a good treatment of networks. Again the general public does not realize that the Internet is almost purely UNIX. There are all sorts of things it forgot to leave out so you can have an excuse to buy more books.