I need to remotely shutdown and reboot Linux (Ubuntu) machines without logging into them (otherwise simple commands can do the job). The machines are just cheap PCs so there are no special power management hardware installed (though they can wake-on-lan). Is there some sort of "power management server" software that I can install on those boxes, which listens to remote requests for reboot/shutdown and acts accordingly? Of course it would be nice if it requires some authentication (password) in order to respond to the requests.

linux shutdown remote-access reboot wake-on-lan
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