getproxies bash function. Call it with the PAC proxy url. It will try to use it with curl connecting to githubs https to check wether this PROXY is good for https connection or not.

get-proxies-function.sh

# use with argument $1 - proxy auto discovery address
function getproxies() {
  PROXIES=( $(curl $1 2>/dev/null | perl -ne 'if(/PROXY ([^";]*)/g){ print "$1\n";}'))
  for proxy in ${PROXIES[*]} ; do
    if "curl" -s -x $proxy --connect-timeout 5 https://github.com &> /dev/null ; then
      echo "$proxy : OK"
    else
      echo "$proxy : not working $?"
    fi
  done
}