DEVELOPER LINKS
The 15 Essential UNIX commands
This is a good quick reference of the basics. It is from the website of Pete Freitag, software developer from New York. The site is worth a browse, it has a cheat sheet roundup!
Development Blog for OpenAudit version 2
This is the development blog of Mark Unwin, creator of OpenAudit. OpenAudit is a great tool for network administrators, it is Open Source and works on all kinds of Operating Systems!
Unix screen command overview
Indiana University has written up a great overview on the screen command for Unix. With this great little command you can login to a bash environment and startup multiple processes from one login. It is resource efficient and not necessarily reliant on your connection to the remote system.