See www.zsh.org for more information and sources.
This package contains a basic zsh binary and associated data, including xterm terminfo in case none is present for some folks who may need it. It will automatically install itself to the proper locations and generate an install.log in its DroboApps directory. There is also a handy uninstall script as well.
It’s not advised that you edit /etc/passwd to make this your login shell just on the off chance of an issue. It’s quite safe to run it after you log in, of course.
There’s also an example .zshrc placed in /root/ for you to edit to your liking!