From: "MrBanabas@..." Date: 2008-12-17T18:37:47+09:00 Subject: Block execution of script while same script is already running Hi, Does anybody no how I may achieve it: Bob is starting script my_test.rb which runs a over an hour... 5 minutes later... Alice is not knowing that Box has already started is and starts it again. Script should detect that it is already running and stop executing. What is the best way to achieve this? Thanks a lot. -- Volker