| The shell is the primary user
interface to a UNIX system. The concept of the shell was introduced in
Chapter 1 along with other key UNIX operating system components: the kernel
and the file system. The UNIX environment provides support for
many built-in (i.e. Bourne, C, Korn) and third party shells.
This chapter provides a brief review of the function of the shell and
focuses on the two main ones used with UNIX systems today: the Korn
Shell and the C Shell. It goes into greater detail about the unique
features of each shell and provides information on how to become more
efficient by using custom prompts, aliases, history, and re-execution
of commands.
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