Expert: Narendra - 8/13/2006

Question
why v r using exit(0) in some program...wat it exactly do..

Answer
I think you can very easily see a detailed information of this in a man page.
exit() is a function, which is used to exit from a program.
When you execute a program, your shell will start a process and that process is nothing but your program.
So, when your program returns, how will the shell know, whether it finished successfully or not?
So, you will pass 0 or some value to shell, so that you can use it to know the exit status.
Usually 0 is considered success.
And there can be many reasons for failure.
So, you can return many different values.
And read the exit status to know the cause of failure.