Howto ban IP with Fail2Ban manually by command line?

Ban IP manually

fail2ban-client set jail_name banip xx.xx.xx.xx

fail2ban-client -vvv set JAIL banip WW.XX.YY.ZZ

Check the jail where to add the IP using fail2ban-client status

Both commands may require to be executed as sudoer. In this case add a sudo before them.