script to use to monitor memory utilization

memory.sh

#!/bin/bash

function alert {
    curl --header 'Access-Token: <access_token_here>' \
         --header 'Content-Type: application/json' \
         --data-binary '{"body":"Memory Threshold Reachd","title":"Database Server Alert","type":"note"}' \
         --request POST \
         https://api.pushbullet.com/v2/pushes
}


# Checks

THRESHOLD_PERCENTAGE=90
TOTAL=$(grep MemTotal /proc/meminfo | awk '{print $2}')
FREE=$(grep MemFree /proc/meminfo | awk '{print $2}')

let "USED = $TOTAL - $FREE"
let "USED = $USED * 100"
let "USED_PERCENTAGE = $USED / $TOTAL"

echo "USED "$USED_PERCENTAGE

if [ $USED_PERCENTAGE -gt $THRESHOLD_PERCENTAGE ]
then
    alert
fi