Memory usage

ram.sh

total=`sysctl hw.memsize | awk '{print $2}'`
total=`echo $total / 1024 | bc`

physmem=`top -l 1| grep PhysMem: | sed s/M/*1024/g`

#wired=`   echo $physmem | awk '{print $2}'  | bc`
#active=`  echo $physmem | awk '{print $4}'  | bc`
#inactive=`echo $physmem | awk '{print $6}'  | bc`
used=`    echo $physmem | awk '{print $8}'  | bc`
free=`    echo $physmem | awk '{print $10}' | bc`

echo "$used megabytes used"
echo "$free megabytes free"
echo "$total megabytes total"