Secure Programming for Linux and Unix HOWTO
by David A. Wheeler
This book provides a set of design and implementation guidelines for writing secure programs for Linux and Unix systems. Such programs include application programs used as viewers of remote data, web applications (including CGI scripts), network servers, and setuid/setgid programs. This document includes specific guidance for a number of languages, including C, C++, Java, Perl, Python, and Ada95.
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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 Dan Heller, Paula Ferguson, David Brennan - O'Reilly
The Motif Programming Manual is a source for complete, accurate, and insightful guidance on Motif application programming. There is no other book that covers the ground as thoroughly or as well as this one. The book has been updated to Motif 1.2.
by Jerry Peek - O'Reilly
This book explains how to use, customize, and program with MH electronic mail commands, available on virtually any UNIX system. MH is notable for its flexibility: you'll be able to do things you never thought you could do with an email program.
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.