Linux: The Good Stuff Book Bundle
Linux: The Good Stuff Book Bundle
www.humblebundle.com
Humble Tech Book Bundle: Linux, the Good Stuff by No Starch
Unlock new levels of freedom and creativity when you use Linux—master the ins and outs of Linux today and help support charity!
Most of those books seem to be targeted at experienced users, however there are a couple about working with the CLI and one about "how Linux works". I wish those books were in the lowest tier, it kinda makes sense. Perhaps somebody will find it useful.