Error Handling on a PERL script

System

I have a PERL script that takes information entered into a template and generates it into XML. The problem we are having is that the template has an ID. There cannot be duplicate ID's entered or information on the site will get messed up. I added a sub procedure to the perl script comparing all the ID's to make sure duplicates don't exist I was wondering if their was a way to either stop the generation, or throw an error so the user would know the files cannot be generated because there is a duplicate ID entered. Is this possible? Or is there a better way to go about doing this?

jbonifaci

Well, you need to provide more information about the context in which your perl script is being called. Also, how is the id being created? If it is user entered, as it sounds, is there a reason it needs to be entered by the user? Why not just generate it for them and then you don't have to worry about duplicates?

~Jeff