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is it possible to get notification from OS X (10.5 Leopard or higher) that the UPS has gone onto battery - i.e. are there any notifications or system config changes I can monitor?

If it's possible via a bash script that would be great!

Thanks for any help.

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Would probably help to state which UPS you're using, just in case. –  slhck Jun 28 '12 at 12:03

2 Answers 2

A quick search of Macupdate for "UPS" shows a variety of software, some of which is old enough where it will likely work with 10.5.8.

OS X 10.6 and higher has decent support for UPSes via USB connections and can set shutdown behavior based on a variety of criteria, at least on my home Mac Pro with an APC SmartUPS.

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Check and see if apcupsd is supported with OS X 10.5 Leopard.

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