C Shell Variables

What are variables used for within your shell? They typically interact with your shell to determine how your environment works, and what it appears like to you. Variables are used to customize your environment, define the appearance of your prompt, define your path, tell the system what type of terminal you are using, tell the system where your mailbox is and whether you want to be notified when you receive mail, etc.

The C shell has two distinct variable types:

1. Pre-Defined Shell Variables
2. Environment Variables