Guide to X11
by Steve Ambler, et al.
Publisher: Wikibooks 2010
This book is about the X Window System. Some users describe it as the Unix and Linux graphics drivers. X11 is the graphical environment for most Unix or Unix-like systems, including *BSD and GNU/Linux; it provides access to screen, keyboard, and mouse.
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by Machtelt Garrels
Useful concepts in the daily life of a Bash user. Basic shell knowledge is required. Discussion about common shell practices and building blocks, grep, awk and sed tools with more examples. The second part is about loops, functions and traps.
by Mark Bates - ConqueringTheCommandLine.com
Learn to master the most valuable and useful command line tools for Unix and Linux based systems. In this book you will find not only the most useful command line tools you need to know, but also the most helpful options and flags for those tools.
by Chet Ramey, Brian Fox - gnu.org
A description of the features that are present in the Bash shell. GNU Bash is an implementation of the POSIX.2 specification, with additional features from the C-shell and Korn shell. Most Bourne shell scripts can be run by Bash without modification.
by Mark Burgess - Oslo College
The Unix Programming Environment is a revised version of the UNIX compendium which forms the basis for a one or two semester course in UNIX. It is a reference guide which contains enough to help you to find what you need from other sources.