[root@ent0026 ~]# history | grep fire
  753  06-04 15:09:58 # systemctl stop firewalld.service
  754  06-04 15:10:25 # systemctl start firewalld.service
  755  06-04 15:11:44 # firewall-cmd --add-port=18080/tcp --permanant --zone=public
  756  06-04 15:11:52 # firewall-cmd --add-port=18080/tcp --permenant --zone=public
  757  06-04 15:13:29 # firewall-cmd --add-port=18080/tcp --permanent --zone=public
  758  06-04 15:14:02 # systemctl restart firewalld.service
 1000  02-13 14:32:19 # history | grep firewall
 1001  02-14 09:04:37 # history | grep fire

# OH I WONDER WHY IT WAS RUN THREE TIMES.

[root@ent0026 ~]# firewall-cmd --add-port=8081/tcp --permenant --zone=public
usage: see firewall-cmd man page
firewall-cmd: error: unrecognized arguments: --permenant
[root@ent0026 ~]# firewall-cmd --add-port=8081/tcp --permanant --zone=public
usage: see firewall-cmd man page
firewall-cmd: error: unrecognized arguments: --permanant
[root@ent0026 ~]# firewall-cmd --add-port=8081/tcp --permanent --zone=public
success