MemTotal=`cat /proc/meminfo | grep MemTotal | awk '{print $2}'`
MemFree=`cat /proc/meminfo | grep MemFree | awk '{print $2}'`
Buffers=`cat /proc/meminfo | grep Buffers | awk '{print $2}'`
Cached=`cat /proc/meminfo | grep Cached | grep -v SwapCached | awk '{print $2}'`
MemUsage=`echo $MemTotal" " $MemFree" "$Buffers" "$Cached |awk '{print ($1-$2-$3-$4)/$1}'`
echo $MemUsage