change swap size ubuntu code example

Example 1: create swapfile ubuntu

sudo swapon --show

Example 2: create swapfile ubuntu

/swapfile swap swap defaults 0 0

Example 3: create swapfile ubuntu

sudo fallocate -l 1G /swapfile

Example 4: create swapfile ubuntu

sudo mkswap /swapfile

Example 5: create swapfile ubuntu

sudo chmod 600 /swapfile