Automatically shutdown serwer when usage is lower than 25% for at least 30 minutes.

shutdown.sh

#!/bin/sh

BASEDIR=$(dirname "$0")

file="$BASEDIR/inactivity_count.txt"

if [ ! -e $file ]
then
    touch $file
    echo 0 > $file
fi

cpu_usage=$( ps -A -o %cpu | awk '{s+=$1} END {print s }' | awk -F. '{print $1}' )

counter=`cat $file`

cpu_treshold=26

if [ $cpu_usage -lt $cpu_treshold ]
then
    echo $(($counter + 1)) > $file
else
    echo 0 > $file
fi

if [ $counter -gt 30 ]
then
    echo "Shutting down server due to inactivity."
    echo 0 > $file
    sudo shutdown
fi