Autoconf Tutorial - Introduction to programming using GNU's autoconf system. Autoconf simplifies the porting process and provides a consistent build interface for system administrators. IP Filter - TCP/IP Packet Filtering package Unix programming resources and examples - Annotated source code examples for most Unix system and library calls. Plus working source code examples of some classic algorithms. UNIX and Programming Section - Tutorials and manuals for Java and PHP. Unix Signals and Process Groups - Short survey of Unix signal handling and process groups, conceptually and with interface descriptions. UNIX programming examples - Several programming topics under UNIX, covered through a recipes and examples style.