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 Arnold D. Robbins
This tutorial covers the entire spectrum of awk script development: From the basics of opening, searching, and transforming text files, to a comprehensive tutorial for regular expressions, to more advanced features like internetworking.
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 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 IBM Redbooks - IBM
This is a study guide for professionals wishing to prepare for the certification exam to achieve: IBM Certified Specialist - AIX V4.3 System Administration. It helps AIX administrators develop the knowledge and skills required for the certification.