#!/bin/sh

#memory used 
#total - free - buffers - cache

total=$(cat /proc/meminfo | grep MemTotal | cut -d: -f2 | tr -d [:space:] | cut -d"k" -f1)
free=$(cat /proc/meminfo | grep MemFree | cut -d: -f2 | tr -d [:space:] | cut -d"k" -f1)
buffers=$(cat /proc/meminfo | grep Buffers | cut -d: -f2 | tr -d [:space:] | cut -d"k" -f1)
cached=$(cat /proc/meminfo | grep Cached | cut -d: -f2 | tr -d [:space:] | cut -d"k" -f1)

used=$(echo $total - $free - $buffers - $cached | bc)

printf "Mem Used: %.2f GB" $(echo "$used / 1024 ^ 2" | bc -l)