docker auto shutdown

# wget https://gist.github.com/auwsom/df90768bd9ef29bde3ea47e464f0d549/raw 
# https://stackoverflow.com/questions/30556920/how-can-i-automatically-kill-idle-gce-instances-based-on-cpu-usage
#!/bin/bash
threshold=1

count=0
while true
do

  load=$(awk '{u=$2+$4; t=$2+$4+$5; if (NR==1){u1=u; t1=t;} else print ($2+$4-u1) * 1000 / (t-t1); }' <(grep 'cpu ' /proc/stat) <(sleep 1;grep 'cpu ' /proc/stat))
  load2=$(printf "%.0f\n" $load)  
  echo $load
  echo $load2
  if [[ $load2 -lt $threshold ]]
  then
    echo "Idling.."
    ((count+=1))
  fi
  echo "Idle minutes count = $count"

  if (( count>10 ))
  then
    echo Shutting down
    # wait a little bit more before actually pulling the plug
    sleep 300
    history -a
    sudo poweroff
  fi

  sleep 60

done