swapoff

#!/usr/bin/env bash

free_memory=$(free -m -l -t -h | awk '/Mem/ {print $4}')

create_swap_if_needed() {
  if [[ $free_memory == 0 ]]; then
    echo "Creating swap file..."
    sudo sh -c "
      swapoff
      dd if=/dev/zero of=/swapfile bs=1G count=4 status=progress; sync
      mkswap /swapfile
      swapon /swapfile
    "
  fi
  echo "$free_memory"
}

check_for_reboot() {
  if [[ $free_memory == 0 ]]; then
    echo "Free memory is 0, rebooting..."
    sudo reboot
  else
    echo "Free memory is sufficient."
  fi
}

main() {
  free_memory=$(create_swap_if_needed)
  check_for_reboot
}

main