memUsage.sh

#!/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