Thursday, 22 November 2012

Shell in Unix Operating System


By on 07:41

Shell is the program which interpret the command given by the users.Command can either be type through keyboard or passed by script.

Unix shell is divided into 4 types namely:-

a)Bourne Shell
b)C Shell
c)Korn Shell
d)Bash Shell

a)Bourne Shell:-Bourne Shell is the shell which was developed by Dr. Steven Bourne at AT&T lab(USA).Bourne Shell is the oldest shell type among all the shell that I have mentioned below.

Key features of Bourne Shell:-

1)It can execute commands in the background.
2)Redirects inputs and outputs.
3)It uses wild cards.

b)C Shell:-C Shell is the shell developed was by Bill Joy at University of California. C shell is created after Bourne Shell.

Key features of C Shell:-

1)It uses wild cards.
2)Redirects Input and output.
3)Integer Arithmetic.
4)Abbreviation of commands.

c)Korn Shell:-Korn Shell is the shell which was developed by David Korn at AT&T lab.Korn Shell is rich in many features.

Key features of Korn Shell:-

1)Redirects Input and output.
2)Integer Arithmetic.
3)Abbreviation of commands.
4)Feature like history mechanism of commands.

Bash Shell:-Bash Shell is the shell which was developed by Brain Fox and Chet Ramey.

Key features of Bash Shell Shell:-

1)Redirects Input and output.
2)Integer Arithmetic.
3)Abbreviation of commands.
4)Built in shell command.

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