How to automatic close port using cron in linux

In this article I would like to share about how to close ports on linux automatically. This was started because of the specific ports that run without my willingness. We just need to schedule a cron job to do that, and then just monitors to see whether our script run as we will or not. The following scripts are used:

[root@localhost ~]# lsof -i:22
[root@localhost ~]# crontab -e
*/3   *  *  *  *  /sbin/fuser -k 22/tcp
[root@localhost ~]# tail -f /var/log/cron