echo "/sbin/ipfw add 1 allow ip from any to any" | at 15:15
at 15:15
/sbin/ipfw add 1 allow ip from any to any
^D
echo "echo 'Let's Encrypt certificate will expire in 2 days (on 20.04.2025)' | mail -s 'Certificate Expiration Notice' root" | at 00:00 20.04.2025