Learning Modern Linux

I recently started a new job and returned to some of my old projects. All of those require a good overview of Linux. Incidentally, I've got the Learning Modern Linux book by M. Hausenblas. I read the book completely from chapter to chapter and can say that it was worth my time. It covers the basics of Linux, from kernel to shell to filesystems and networking. It's broadened my overview and understanding of Linux, and I would recommend this book.