Recommendations on UPS Battery Backup monitoring software

What is a good open source program for monitoring various models of APC brand battery backups? I need notification of power loss, power restore, and imminent UPS shutdown (battery depleated). This latter is usually signaled by rapid series of beep lasting about 30sec to a minute.

This needs to run in the background via cron or service, or monitoring program, not GUI. I don't particularly care about the software creating log files. What I need to for it to run something (e.g. a script I create) when these events occur.

What do you recommend? (please, only people who have installed/used such software respond. I know how to google)
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Dan CraciunIT ConsultantCommented:
Pretty much the norm is NUT.
Most of the APC UPS are supported.  You'll need to connect the UPS directly to the computer with nut installed or use SNMP, if your UPS supports it.

I use it with Nagios and check_nut_plus to monitor 8 UPS in 5 locations. With Nagios you can define actions for warning and critical conditions. With nut you can shutdown the computers when the battery is below a critical level.

MarkAuthor Commented:
OK, I'll check it out and post back. Another recommendation I got was apcupsd. Do you have any experience/thoughts on that one?
Dan CraciunIT ConsultantCommented:
If you only use APC made UPS, then apcupsd is a good option. Basically Powerchute for Linux.

Nut works with other brands of UPS too.

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MarkAuthor Commented:
Would NUT or apcupsd offer any advantages over the other? I've downloaded both, but would really like to start with the best choice before installing/testing.
MarkAuthor Commented:
Sorry for letting this one sleep. I've been using apcupsd for several months, through a couple of power outages, and it seems to work fine.
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