Free up unused memory [ubuntu]

freeme

#!/bin/bash
#
# Release memory used by the Linux kernel on caches.

free -m
sudo sysctl -w vm.drop_caches=3
sleep 5
sync && echo 3 > sudo /proc/sys/vm/drop_caches
free -m

# 1 -> to free pagecache
# 2 -> to free dentries and inodes
# 3 -> to free pagecache, dentries and inodes

#
# Reference: http://www.commandlinefu.com/commands/view/2888/release-memory-used-by-the-linux-kernel-on-caches
#