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 ...

The basic syntax for an if command is “if value == other_value”. The == performs a comparison, and it’s necessary to ensure that the shell sees one value on each side of the comparison operator.

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.

Working on the command line is an integral part of being a successful Linux user. You need to have a firm grasp of certain commands to work effectively. There are even certain commands that you must ...