Shell Basics
Now that you’ve seen what the shell is, and how to interact with it, let’s take a look at some of the shell features. This section walks through some of the features available in most Linux shells.
Commands
As mentioned earlier, the Linux shell allows you to perform two types of functions—run a built-in command and launch an external program. The external programs that you can launch must be accessible from the Linux system—either installed directly on a hard drive or removable media device or available on a network shared drive.
If you’re ever in doubt about a program, you can use the type shell built-in program. The type program provides quick information about a command or application, such as whether or not it’s a shell builtin ...
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