I was just beginning in Linux programming when I bought this book. It was fantastic. The authors provide clear yet concise explanations of basic Linux system calls and library functions, as well as tons of background information concerning the inner workings of Linux and basic knowledge that one coming from a Microsoft background may not have considered. The book is very well-written and is easy to follow, with some humor along the way. All of my questions of the specific subject material seemed to be answered very soon after they popped in my head.

One word of caution, though. I was proficient in C# on Microsoft platforms prior to starting this book, so it was quite a shock going to pure C in Linux. I would strongly recommend a basic knowledge of C and how it differs from C++ and C# beforehand. Be sure to have a thorough understanding of pointers, pointers to arrays, pointers to multi-dimensional arrays, and anything else concerning pointers. The authors seem to expect it.

All in all, though, I give it an A+!