Lists of Unix Commands

Help for specific problems

Unix resources/tutorials

1, 2, 4Basic Unix Unix concepts.
3Networking and Firewall there is a "Networking Concepts Howto", a "Packet Filtering Howto" and several tutorials for IP tables at this site. Some of the documents are available in several languages (including French and Chinese).
5Named Quick reference for the configuration files; more detailed HowTo configure DNS.
6, 7Apache starting the server, configuration files, virtual hosts, FAQ
12Non-Linux Unix Here is an overview of differences between different flavours of Unix.