Rating: 
Summary: missing HPUX and Digital UNIX
Review: This book is very complete for the OS's it covers. However, it doesn't cover HPUX or Digital Unix, which, AFAIK, are pretty popular variants of UNIX (especially HPUX).Don't get me wrong...it's a real buy. The cross-reference and details (including examples) are excellent, and it's a "must" for persons having to deal with a heterogeneous OS environment; or for admins/users having to get used to a new OS. I just wish the cover didn't say, "Every Command \ Every Operating System \ Cross-Referenced Together". That, to me, is misleading.
Rating: 
Summary: Ambitious...and it delivers
Review: While initially quite skeptical of a book attempting to cover such disparate operating systems, the reality is that I have found this volume to be indespensible. Since I work with Red Hat Linux primarily and Solaris (v8) also rather frequently, it's easy use the UCG to get the syntax differences of those two environments. Sure, I could just scan the man pages -- but the already well-worn out copy of my UCG has enough bookmarks and paperclip (and yellow highlights) to make turning to it easier. It has also helped me better understand that there are quite a few ways to perform networking tasks using the Windows command line (as opposed to becoming dependent on the GUI). The charts showing the equivalency of commands across the diverse operating environments is a real time-saver. As a partisan of the O'Reilly books, I've come to the general conclusion that the value of a book is inversely proportional to its size. A big, thick book is generally fluff. But, this one is the exception.
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