centos6, centos5 free -m memory percentage check

get_memory_percentage.sh

DATE=`date`;
MEM_TOTAL_REAL=`free -m | head -n 2 | tail -n 1 | awk {'print $2'}`
MEM_USED=`free -m | head -n 2 | tail -n 1 | awk {'print $3'}`
MEM_BUFFER=`free -m | head -n 2 | tail -n 1 | awk {'print $6'}`
MEM_CACHED=`free -m | head -n 2 | tail -n 1 | awk {'print $7'}`

TEST=$(($MEM_USED-$MEM_BUFFER-$MEM_CACHED));
RESULT=$(($TEST*100))
RESULT=$(($RESULT/$MEM_TOTAL_REAL))

echo "-----------------------------------------------------"
echo "1. Memory Total  $MEM_TOTAL_REAL";
echo "2. Memory Used   $MEM_USED";
echo "3. Memory Buffer $MEM_BUFFER";
echo "4. Memory Cached $MEM_CACHED";
echo "-----------------------------------------------------"
echo "[$DATE] Result : $RESULT %";