Unix Organization Consists of ----

1) Hardware : It is used to execute the command.

2) Kernel: 

> Which is used to schedule tasks and Manage storage.

> It is heart of the operating System.

> Kernel tells the computer to read all files on disk & display them on screen

3) Shell: 

> Shell is the interpreter between user and the computer system.

> Which connects & interprets users commands, call programs from memory and executes them. 

> shell also gives the functionality of "PIPES", where no.of commands can be linked together, & allowing the output of one program to become input of another program.

There are 3 types of shell. They are

> Bourne Shell(.sh)

> CShell (.csh)

> Kourn Shell (.ksh)

> Using CShell we can convert actual commands in unix into our own command. In Cshell we have DOS Key(we will get previous commands)

> In Unix there is no DOS Key.

4) Tools & Applications: 

> Has the functionality to the operating System.

> Tools are grouped into categories for certain functions, such as word processing, business application and Programming etc.