UFW rule from a list of IPs

In this post, I will show you how to manage ufw rules using a list of IPs by commands.

First, we need to store the list of IPs into a file, IPs.txt for example:

1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
// leave the last line an empty new line

Please note that you must leave the last line an empty new line, read this post to understand why.

The command bellow will print every single line in IPs.txt file:

while read line; do echo $line; done < IPs.txt

Replace echo $line with  ufw allow from $line to any port 22, we will have the command that allows the list of IPs to access your server via SSH port:

while read line; do ufw allow from $line to any port 22; done < IPs.txt

To reverse the command above:

while read line; do ufw delete allow from $line to any port 22; done < IPs.txt

More useful ufw commands here.