Simple ShellScript to free your memory and cache on Linux systems

clean_memory.sh

#!/bin/sh
before=`free -m| grep -A1 free|tail -1 | awk '{print $4}'`
echo "free memory before: $before Mbytes"
echo "cleaning mem!"
sync; echo 3 > /proc/sys/vm/drop_caches
after=`free -m| grep -A1 free|tail -1 | awk '{print $4}'`
gift=`expr $after - $before`
echo "free memory after: $after Mbytes (gift of $gift Mbytes)"
echo "done."