monitor.sh

#!/bin/bash

mem=$(free -m | awk 'NR==2{printf("%d\n", $3*100/$2)}')
disk=$(df -h | awk '$NF=="/" {sub(/%/, "", $5); print $5}')
cpu=$(awk '/^cpu/ {usage=($2+$4)*100/($2+$4+$5)} END{printf("%d\n", usage)}' /proc/stat)

if [ "$cpu" -ge "80" ]
then
	notify-send -u critical "The CPU Almost Filled: $cpu"
fi


if [ "$disk" -ge "80" ]
then
	notify-send -u critical "The DISK Almost Filled: $disk"
fi


if [ "$mem" -ge "80" ]
then
	notify-send -u critical "The MEMORY Almost Filled: $mem"
fi