Disable APC UPS Beeper

I was about to go to bed, and my UPS started beeping once per second to tell me to get a new battery.

I began searching for how to disable the beeping so I could get some sleep - starting with searching the UPS for an STFU button.

I already had NUT (Network UPS Tools) installed, so the command was actually very easy once I knew what I was looking for.

/etc/nut/ups.conf:

[smart1500]
    driver = usbhid-ups
    port = auto

/etc/nut/upsd.users:

[admin]
    password = admin
    allowfrom = localhost
    acctions = SET
    instcmds = ALL

# upscmd -l smart1500
Instant commands supported on UPS [smart1500]:

beeper.disable - Disable the UPS beeper
beeper.enable - Enable the UPS beeper
beeper.mute - Temporarily mute the UPS beeper
beeper.off - Obsolete (use beeper.disable or beeper.mute)
beeper.on - Obsolete (use beeper.enable)
load.off - Turn off the load immediately
load.off.delay - Turn off the load with a delay (seconds)
shutdown.reboot - Shut down the load briefly while rebooting the UPS
shutdown.stop - Stop a shutdown in progress
test.battery.start.deep - Start a deep battery test
test.battery.start.quick - Start a quick battery test
test.battery.stop - Stop the battery test
test.panel.start - Start testing the UPS panel
test.panel.stop - Stop a UPS panel test

# upscmd smart1500 beeper.disable
Username (root): admin
Password: