I haven’t read it yet, but it seems a nice Linux book.

Here is the release announcement:

I’m happy to announce the release of my first Free eBook — Linux 101 Hacks. There are total of 101 hacks in this book that will help you build a strong foundation in Linux. All the hacks in this book are explained with appropriate Linux command examples that are easy to follow.

You can download the book from the author’s blog.