As above. Is there anybody who knows the answer to my question?
I tried:
sudo shutdown
sudo shutdown now
sudo power off
sudo poweroff
sudo halt
but I had responses like “command not found,” etc.
I searched for documentation about a similar topic, and I didn’t find any useful information. Finally, I switched the power off, but this way, I damaged one RPi 4 yesterday.
Power off any device isn’t a special occasion command, and I’m very surprised that I can’t find useful information about this topic.