Little script to print out your memory usage

ram.sh

#!/bin/bash

# free is a utility which provides statistics about memory in use
# -m flag provides memory in Mb
# awk takes all the arguments from grep and can print them
USED=`free -m | grep cache: | awk '{print $3}'`
TOTAL=`free -m | grep Mem: | awk '{print $2}'`

# bc is a linux calculator which can print floating point
# scale determines number of decimals (ex: 0.00)
printf "%.2f%%\n" $(bc <<< "scale=5; $USED*100/$TOTAL")