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On the menu bar at the top you can reboot octoprint, reboot the system and shutdown the system
Thanks for the reply!
I knew that, though -- I was meaning how to do it without being at a computer (using a hardware button connected to Raspberry Pi, or from a smart phone. Octoprint Anywhere doesn't support shutdown I requested it, but it was not added). I want to do shutdown without running up and down stairs from the computer to do the software shutdown and then to the printer for a power disconnect to avoid SDCard corruption.
( deleted the question after realizing that I'd asked it before)
You can load the web interface on your smartphone and use the same menu option to shutdown octoprint or the pi.
Thanks, yes that works (at least it does now with my phone that has a larger screen!).
I use Printoid on my smart phone which allows me to shutdown from anywhere