As promised, I went to my bookshelf and picked four books that are recommended. Depending on your interests, some might not apply for you. The first book is for people who want to really dig into the UNIX kernal, file descriptors, inodes, etc
The Design and Implementation of the 4.2BSD UNIX Operating System This book is out of print and is mostly for those who want to really have a good historical background on the UNIX OS and it not something most UNIX admins would read. One of the most important books for all UNIX folks (a most know and have) is:
DNS and BIND is perhaps one of the most important foundation books for understanding UNIX networking; and without networking UNIX is not very useful. Everyone must have this book! Another
MUST HAVE is
TCP/IP Network Administration better known as
THE CRAB BOOK. Without understanding TCP/IP network adminstration you can only swim in the 'UNIX baby pool'
Switching gears, understanding history is always fun and very important. This is the best and most factual history book on the Internet without a doubt:
Where Wizards Stay Up Late - The Origins of the Internet. This book has the names, faces and stories of the real heros of the Internet, not the false heros of todays media. In this book you will read how Dr. Kleinrock sent the worlds first email message to locate his lost razor! Messaging is the most important core service that the network offers. Regardless of your career path, you must understand messaging. That brings me to the last MUST HAVE book of this post:
SENDMAIL is critical in your studies. You don't have to master every flag and switch, that is impossible!! However, you must understand the basics of heterogenous messaging systems and sendmail is the great-grandfather of the Internet. Learn about messaging and always be an expert in heterogeneous email architectures. No organization can survive without robust messaging.
That is all for today. I have a few more on networking that are essential academic texts for those who, like me, do not see UNIX as an OS but as a networking philosophy. If you would like, I will post the networking books as well.