How can I have zsh as my default shell?
Everybody on the system has to use tcsh as login shell, because this allows us to put a standard configuration into each account. But don't worry, it's no problem to change the shell for all further operations after the login. Just put setenv SHELL /bin/zsh into your ~/.cshrc file (if your shell is the tcsh) or in ~/.bashrc (if your shell is already switched to bash) . Each terminal you start will then invoke zsh.