I saw your subject line and thought you were referring to UPS the parcel destroyer, and thought, gee that's a silly question. I have very low expectations of UPS.
On topic now, I think there is a nice utility called apcupsd that can do this. It also should allow multiple servers connected to a UPS to be able to shutdown cleanly in the event of battery exhaustion. /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
