I wasn't very impressed with this book. After reading HTML4 for WWW, I thought this would be good too. It was hardly any reference material at all. I would not recommend this for a professional developer. I agree with another reviewer that said He was thinking of throwing it away. Disappointing, don't waste your money on it.
I used this book as a refresher and for reference. The book was one of the best that I could find on Unix. It didn't have much on permissions, perl or sed. But, overall it is a good book for you library.
This the second book that I've read on C. It is a great book to gain a solid understanding of the language. The C++ and Java sections really whet your appetite for those languages. Overall, I felt the quality of the writing was outstanding and very easy to follow. Being in the business world, I chose to skip some of the scientific examples. The book has a great section on unix makefiles and permissions. I recommend this book for any programmer's library. Very enjoyable and applicable reading !