SWAP=`free | grep Swap: | awk '{ print $2 }'`

if [ $SWAP -eq 0 ]; then
   echo
   echo "No swap space found, creating swap file 50% of RAM size..."
   echo
   
   MEM=`free | grep Mem: | awk '{ print $2 }'`
   swapoff -a
   rm -f /pagefile.sys
   dd if=/dev/zero of=/pagefile.sys bs=100K count=$(($MEM*50/10000))
   mkswap -f /pagefile.sys
   grep -v swap /etc/fstab > /tmp/fstab
   mv -f /tmp/fstab /etc
   echo "/pagefile.sys           none            swap            sw              0 0" >> /etc/fstab
   swapon -a
fi