Publisher: Wikipedia 2014
Linux is a Unix-like and POSIX-compliant computer operating system assembled under the model of free and open source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on 5 October 1991 by Linus Torvalds.
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by Mark Wilding, Dan Behman - Prentice Hall PTR
The book goes into details about the linux system, how to use built in tools, how to read C source code, how that C source translates into assembly, how different assembly optimizations can make debugging difficult, the memory heap and stack, etc.
by William E. Shotts, Jr. - Lulu.com
Designed for the new command line user, this volume covers the same material as LinuxCommand.org but in much greater detail. In addition to the basics of command line use and shell scripting, the book includes some more advanced topics.
by D. Cantrell, L. Johnson, A. Hicks, C. Lumens - FreeBSD Mall
This Book in designed to get you started with Slackware Linux operating system. It`s not meant to cover every single aspect of the distribution, but rather to show what it is capable of and give you a basic working knowledge of the system.
by Simone Demblon, Sebastian Spitzner - The Shuttleworth Foundation
A textbook that shows the internal workings of the system in an approachable fashion, so that anyone can use this text to learn. The authors explain the lower level information without becoming too entrenched in the nitty-gritty details.