Update UFW with IPs from GitHub

update-ufw-github.sh

#!/bin/bash

github=$(curl -s https://api.github.com/meta | jq -r '.web | .[]' | sed 's~/32~~' | sort)
ufw=$(ufw status | grep '# GitHub' | awk '{print $1}' | sort)

comm -13 <(echo "$ufw") <(echo "$github") | while read addition; do
    echo "Adding $addition"
    ufw allow out to $addition port 22 comment GitHub
done

comm -23 <(echo "$ufw") <(echo "$github") | while read deletion; do
    echo "Deleting $deletion"
    ufw delete allow out to $deletion port 22
done