The O'Reilly book (Learning Unix for OS X) is decent, but it doesn't really get into OS X-specific things. It doesn't even cover Homebrew. IIRC the only exception is a section on the md* commands ...

If you find your thrill delving into the networking side of Unix, you'll find that there are lots of commands to give you all the insights you might want.

If you are starting to experiment with the OS X Terminal, you'll want to know what commands are available. Here are some ways to explore your options.

Memory is one of the most important parts of your Unix system for performance. Let's look at some commands that will tell you what you need to know about the memory on the systems you manage is ...