How, then, to begin the song of praises for the book? Let's start with its comprehensiveness. The authors--a whole passel of them, but miraculously consistent in style--deal with every subject that's central to the Unix universe. Their diligence extends even to detailed coverage of subjects (like the Domain Name System (DNS)) that many authorial squads omit. System administrators need to understand it all--it's good to see everything covered in one book. Of course, you still will need more focused texts for really complicated situations, but the coverage here will carry you a long way.

Although you probably will want to read this book cover to cover eventually, you might first look at the index, which typically will guide you to a couple of sections. First, an overview of the subject that interests you will explain what the service or feature is meant to do, what it isn't meant to do, and how (in fairly general terms) it does its job. You'll find four sections--one each on the relevant configuration facts of the four emphasized Unix variants. These sections aren't presented as explicit sequences of steps (which invariably leave the reader asking, "But, what if... " anyway), but as narratives that are interspersed with commands and configuration file listings. The approach works well, and it's made even better by the syntax summaries and conceptual diagrams that pop up now and then. --David Wall

Topics covered: Administration of Unix systems, with specific reference to Solaris 2.7, HP-UX 11.00, Red Hat Linux 6.2, and FreeBSD 3.4. Administration is a broad subject, and the authors touch on most of its aspects, including user and file operations (basic and advanced), hardware configuration, and kernel tweaking. Networking coverage includes basic connectivity, routing, server software, DNS, and security.