Skype guardian - kill memhungry skype processes

gistfile1.sh

#!/bin/bash
while true; do
  mem_used=$(ps aux | grep -P "\bskype\b" | grep -v grep | awk {'print $5'})

  mem_limit=$((1024 * 512)) # 512mb

  if (("$mem_used" >= "$mem_limit")); then
    killall -9 skype
    notify-send -i error "Skype was killed because it reached $mem_limit KB limit"
  fi
  sleep 1
done