With a computer on every desktop, we sometimes forget that most modern operating systems are designed for more than one user. This talk will take you through the things you need to keep in mind as a user of the most popular multiple-user systems - shared web hosting, and shell servers - such as the UNIX security model, keeping database credentials secure, and the dangers posed by web-administered CMSes.

The principles discussed in this talk are aimed at novice and intermediate Linux users, including those who use Windows on their desktops but manage websites on UNIX hosts, or who use shell servers. Additionally, some tips will be presented for people who are just getting started with administering shared hosting.

David Adam is a volunteer systems administrator for the University Computer Club, and pays the bills by running a Windows network. He enjoys good beer, (very) cheap wine, and spends most of his time as a medical student at UWA.