Is there a best way of having a script check to see if a new version of itself exists and updating it while running?

I'm doing something like this:

• use LWP::Simple to get a url.
• slup the contents of $0
• if contents from the url is the same as the contents from $0, proceed with the actual script.
• if not, warn the user, give them a chance to abort, then save the contents of the url to $0, do a system($0) and exit.

Is there a better way? Are there any pitfalls I might encounter?

Thanks in advance.

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