swap.sh

#!/bin/sh

echo "Create a 4 gigabyte swapfile"
sudo fallocate -l 4G /swapfile

echo "Secure the swapfile by restricting access to root"
sudo chmod 600 /swapfile 

echo "Mark the file as a swap space"
sudo mkswap /swapfile 

echo "Enable the swap"
sudo swapon /swapfile 

echo "Persist swapfile over reboots"
echo "/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab