A kill switch is a way to quickly turn off your computer or encrypt your computer so it's protected against intruders.

Run commands without the sudo password

First we will want all of our wheel users to be able to execute the poweroff command without requiring to tap a password. We will create a file called shutdown in sudoers.d and open it with visudo

sudo EDITOR=vim visudo -f /etc/sudoers.d/shutdown

Add this line to allow the command reboot and poweroff to be run without a password if you're in the wheel group

%wheel ALL=NOPASSWD: /sbin/reboot, /sbin/poweroff

Save it and now you can test running sudo poweroff and your computer should turnoff without a need for a password, perfect for a kill switch.

Bind your kill switch