ANSI C for Programmers on UNIX Systems
by Tim Love
This document aims to introduce C by providing and explaining examples of common programming tasks, and to enable the reader to learn from available source code by clarifying common causes of incomprehension. The first part of the document is an informal introduction to C.
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by Steve Ambler, et al. - Wikibooks
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 Unix or Unix-like systems, including *BSD and GNU/Linux; it provides access to screen, keyboard, and mouse.
by Brian "Beej Jorgensen" Hall
This document discusses several methods of Interprocess Communication, some of which are better suited to certain tasks than others. If you know C or C++ and are pretty good using a Unix environment, these documents are for you.
by Carey Bunks - Sams
This book is not about tips and tricks, and it's not a collection of image manipulation problems. It is about understanding image manipulation concepts, about knowing which GIMP tools are most effective, and about the savvy use of these tools.
by Frank G. Fiamingo - The Ohio State University
Systems administration is the installation and maintenance of the UNIX computer system. The system administrator will need to maintain the software and hardware for the system. This includes hardware configuration, software installation, etc.