Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Now into its fifth edition, O'Reilly's 'Linux In A Nutshell' is a single volume reference manual that covers system admin, editors, shells, booting, regular expressions and more. It provides, in essence, all the key ingredients required to run Linux, whether that be as a user, an administrator or a developer. It's also pretty much independent as regards Linux distribution, thought the material has been tested extensively on Red Hat/Fedora, SuSE and Debian.