#!/bin/sh

total_mem=$(($(grep MemTotal /proc/meminfo | awk '{print $2}') / 1024))
free_mem=$(($(grep MemAvailable /proc/meminfo | awk '{print $2}') / 1024))
    
used_mem=$((total_mem - free_mem))

awk "BEGIN {print ($used_mem / $total_mem) * 100}"