Howto ban IP with Fail2Ban manually by command line?

Question

How do I ban an attacker IP with Fail2Ban manually by command line?

Answer 1

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.