UNIX Operating system

UNIX is one of the most popular operating system worldwide because of its large support base and distribution. Kem Thompson and Dennis Ritchie of AT and T Bell labs developed UNIX Operating system based on the multics Reaserch Project in 1969.

It is composed of :

  • Kernel
  • Shell
  • Utilities and Application

1.Kernel:It is the Heart of the UNIX Operating system.It is the large program that is loaded into memory when machine is turned on.

2.Shell: A Shell is a command line interpretor.It take command and execute them.

      Popular Shell are:

  • Bourne Shell
  • C-Shell
  • Korn Shell

3.Utilities and Application: Unix Operating system support a variety of tasks like copying files, calculating,editing etc.


  • Multiuser
  • Multitasking
  • Portability
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