abubacker - As you will have seen by the responses to your many question over the last day or so :

Many people have pointed you towards How (Not) To Ask A Question - this is because people here don't really appreciate having an answer demanded of them. Especially when something as simple as googling | super searching 'perl file locking' will give you a very comprehensible answer.

You will get a lot better responses if you show what you have tried, looked at or searched for so far, explaining why you are still having a problem understanding something or getting a script to work.

Monks will always help those who help themselves, but get irritated easily when they are treated like a walking encyclopedia. Finding out how to find things out is half the battle, and you really have to teach yourself that! (Although doing a Super Search at PerlMonks is probably one of the better starting places!)