Prevent being locked out when configuring SSH and iptables [duplicate]

There was a similar question Configure iptables over SSH without getting locked out?

I post here the tips I gave in the previous question:

1) I backup the old iptables configuration file:

cp /etc/sysconfig/iptables /etc/sysconfig/iptables.bak

2) Before trying the new settings, execute this command to make sure you can connect back if something in the new settings locks you out (basically it replaces the old rules after 5 minutes):

echo "mv /etc/sysconfig/iptables.bak /etc/sysconfig/iptables && service iptables restart" | at now + 5min

3) Now you can safely modify iptables rules. If something goes bad you can connect back within 5 minutes.

If you need to modify the SSH config, e.g in /etc/ssh/sshd_config: Leave a session open in another terminal. This usually will stay open, but of course you can use a similar trick as in @shardan's post for the SSH config as well.