Remove user

Hi,
What are command to remove a user from OMERO database. In Insight or Web Admin there is no menu to do that. And in command line I found how to add user, but not how to remove a user.
Thanks
Philippe
What are command to remove a user from OMERO database. In Insight or Web Admin there is no menu to do that. And in command line I found how to add user, but not how to remove a user.
Thanks
Philippe