First, I would like to thank Red Hat and CentOS for creating a great operating system. I used CentOS 6.8 exclusively in the writing of this book and it worked flawlessly. I would also like to thank my brother, David, for letting me bounce ideas off of him. Last, but certainly not least, I would like to thank my girlfriend, Gabriele. Her patience was greatly appreciated, and she also helped by letting me log into her Fedora laptop from time to time.