HB PWYW: Linux by Wiley starting at $1

IF you are a fan of the Linux way or you want to start learning or learn more or get re/freshed or re/acquainted with /os/linux, for the next 12 days [from posting-date], Humble Bundle is running a Linux by Wiley (Wiley = book publisher, not coyote), with prices starting at $1 for four ebooks (one is an Ubuntu toolbox type book). $8+ gets you five more e-books, and $15+ gets you another six more (four of them at this tier are certification study guides)