Remote Shutdown Several Macs

Here is my situation. I work in a computer lab containing both PC's and Macs, and at the end of the night, I want to be able to send a message to the users on the Macs stating that the computer will be shutting down in 20 minutes, and will automatically reboot, to force them to get off. This is really simple with the Windows computers, using a tool called "psshutdown", and was wondering if there is something similar on the Macs? Basically in windows, i created a batchfile with the commands like this for each computer one after the other.
psshutdown <computer name> -m <comment> -t <time until shutdown> etc etc.
Does anyone have any suggestions for doing this with the macs?
TIA

This can be done with the AppleRemoteDesktop admin app, though you have to pay for it. Alternatively you could ssh into the machine and do something like "sudo shutdown -r +20 message", though this will only print a message to a terminal, not pop up a GUI warning box. There may other options as well. If you manage many mac workstations, the the AppleRemoteDesktop application would be quite helpful. I use it to manage my lab workstations frequently.

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