Chapter 1. Introduction to UNIX/Linux Shells
What Is UNIX? What Is Linux? A Little History
When learning about the shells, you will find they are often associated with different versions of the UNIX/Linux operating systems. For example, the Bourne and Korn shells are associated with AT&T UNIX, the C shell with Berkeley UNIX, and the Bash shell with Linux. Before delving into the particulars of the shells, this section is provided to give you a little background information about the operating systems on which they reside.
A Little Bit About UNIX
UNIX is a multiuser, multitasking operating system initiated by Ken Thompson in 1969 at AT&T Bell Labs. ...