Reload PAC on macos thanks to: https://q1f4mmprz7gko.wordpress.com/2015/07/10/forcing-mac-os-x-and-safari-to-reload-a-pac-file/

reloadPac.sh

#! /bin/sh -u
networksetup -listallnetworkservices | awk 'NR>1' | while read SERVICE ; do
  if networksetup -getautoproxyurl "$SERVICE" | grep '^Enabled: Yes' >/dev/null; then
    networksetup -setautoproxystate "$SERVICE" off
    sleep 2
    networksetup -setautoproxystate "$SERVICE" on
    echo "$SERVICE" bounced.
  fi
done

I had to add sleep after ON/OFF to make it work.
sleep 2

@animatedcreativity thanks, I updated the snippet.