Free Up Unused Memory in Ubuntu Server

http://www.upubuntu.com/2013/01/how-to-free-up-unused-memory-in.html
http://www.yourownlinux.com/2013/10/how-to-free-up-release-unused-cached-memory-in-linux.html
https://www.tecmint.com/clear-ram-memory-cache-buffer-and-swap-space-on-linux/

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