Use "require" as opposed to "use". You don't need to have any packages or the like with require, though if you look at it's man page, there are a few gotchas for how you call it. But this will do what you are looking for.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain