#!/bin/bash
while [ 1 ]
do
total=`cat /proc/meminfo | grep MemTotal | cut -d ":" -f 2 | cut -d "k" -f 1 | tr -d " "`
free=`cat /proc/meminfo | grep MemFree | cut -d ":" -f 2 | cut -d "k" -f 1 | tr -d " "`
currentTime=`date +%s`
echo -n $currentTime
echo -n " "
echo "$total - $free" | bc
sleep 1
done