If you want to use the Pi Supply switch (on / soft off / hard off) with the Raspberry Pi and Kali, follow the next steps.

• First, do not connect the switch yet, it will power off shortly after booting, and you'll have a go with fsck
• Install required packages:

  sudo apt-get install python-pip curl

• Install the RPi.GPIO module:

  sudo pip install RPi.GPIO

• Download (read) the script and install:

  wget https://pisupp.ly/piswitchcode
  ./piswitchcode

• Connect the switch. Boot the RPi.
• Now you can safely shutdown the RPI using the Pi Supply switch.