Showing posts with label Unix. Show all posts
Showing posts with label Unix. Show all posts

Thursday, 22 November 2012

Shell in Unix Operating System


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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Starting guide of Unix Operating System


Unix is an Operating System which was developed by Ken Thomson and Dennis Ritchie in 1970 at AT&T lab(USA).Now I discuss the key features of Unix Operating.

1)Unix is portable(because it is written in C language).

2)Its a multi-user and multi-tasking operating system.

3) Unix has fully CUI based features but now Unix using the x-windows(some feature of GUI).

4)Unix is case-sensitive.

5)Unix is stable O.S.

Now I discuss the Advantage and Disadvantage of Unix O.S.

Advantage:-

1)Security is high.
2)Virus Protected.
3)Very Stable.
4)Network Support.

Disadvantage:-

1)Difficult to learn(but don't worry I am here).
2)Difficult to Install/download.
3)Not very user-friendly.

Kernel of Unix:-Kernel is the heart of Unix Operating System.It is the core internal part of Unix O.S.
Why we called kernel the heart of Unix??because it(kernel) manage all the hardware device like input/output device,It manage memory as per requirement,it manage date and time functions,manage the files and also allocate and deallocate the memory.

Unix Shell:-Shell is the program which interpret the commands.For more about Unix Shell click here.



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