The preceding hour gave you an overview of the different shells available in UNIX. There are quite a few, but the C shell—originally from Berkeley, California—is the most popular shell at most sites. In this hour, you learn all about the C shell and how to use it to your best advantage. You also learn some valuable tips about working with Korn shell, a popular alternative to C shell. The goal is for you to be able to customize your UNIX environment to fit your working style.