I'm looking for a way to clear caches via the command line (Linux).

I've trawled the discussions here, and google a bit and not been able to find anything - I'm hoping someone's got themselves a nice little script they may share. I started digging through the java docs to write one myself but quickly realised that I'm so out of practice with Java that it'll be a non-trivial project for me to do that - though it would be interesting & fun little project should I have to go that way - just don't want to re-invent the wheel.

TIA