note LetMeAsk Thanks all for the answers, let me detail the situation again, The third party script after completion (first round) ask a question: <code> Select Option : </code> Manually if i supply an "X" then it quits the script but as i am calling this third party script from my perl script i want perl to terminate that script so that the output of the thirdpartyscript can be written to a file(by perl) and so that i can use that file. Sorry if you replied to the exact scenario. Thanks 997872 997997