Delete iptables rule using line number

To easiest way to delete iptables rules, is by listing the rule with line number like below

$ sudo iptables -L OUTPUT --line-number

In this example, we are listing all the rules inside OUTPUT chain, with line number

To delete that rule, use this command

$ sudo iptables -D OUTPUT 1

like below

We can run the first command to verify that the rule has been deleted

$ sudo iptables -L OUTPUT --line-number

like below

To delete multiple rules, just repeat the same steps over and over again.