It is a multi-user, multitasking operating system (OS) developed at Bell Labs in the early 1970s. The most notable members of this team at the Bell Labs research facility were Ken Thompson and Dennis Ritchie. While many of UNIX’s concepts were derivative of its predecessor (Multics) the UNIX team’s decision early in the 1970s to rewrite this small operating system in the C language is what separated UNIX from all others.

On UNIX, there is a Graphical user interface similar to windows that support easy navigation and support environment. With GUI, using a UNIX based system is easy but still one should know the UNIX commands for the cases where a GUI is not available such as telnet session.

There are several different versions of UNIX; however, there are many similarities. The most popular varieties of UNIX systems are Sun Solaris, Linux/GNU, and MacOS X.

Any UNIX operating system consists of three parts and these are as below: –

  • kernel,
  • shell and
  • Programs


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