clear memory cache linux

gistfile1.txt

#!/usr/bin/env bash
if [ `whoami` != 'root' ]
then
        echo "[!] Error: requires root!";
        exit;
fi

echo " * Clearing ram PageCache";
sync;
echo 1 > /proc/sys/vm/drop_caches;

echo " * Clearing ram dentries and inodes";
sync;
echo 2 > /proc/sys/vm/drop_caches;

echo " * Clearing disk swap";
sync;
swapoff -a && swapon -a;