Everybody who wants to make life easier on themselves, power users and sysadmins alike.
Prerequisites/not in this course:
You should be an experienced UNIX user, familiar with basic commands, man pages and documentation
Being able to use a text editor
Understand system boot and shutdown processes, init and initscripts
Create users and groups, set passwords
Permissions, special modes
Understand naming conventions for devices, partitioning, mounting/unmounting file systems
Adding/removing software on your system
See Introduction to Linux (or your local TLDP mirror) if you haven't mastered one or more of these topics. Additional information can be found in your system documentation (man and info pages), or at the Linux Documentation Project.