(My review on goodreads)
After a brief chapter on the most basic of GNU/Linux command-line tools, Ward dives right into Linux internals, starting with a lengthy walkthrough of the boot process. followed by in depth coverage of devices, file systems, and networking.
The final third of the book covers applications, the desktop, and development tools.
I can see this being useful as a thorough introduction to Linux for someone who plans to spend a lot of time doing Linux-y things; and also as a refresher/tutorial/quasi-reference if you want to do something like setup a samba server or figure out how to get a printer connected.
Overall good clear linear exposition.