[389-users] Change User DS in Admin Server with command line

Hello everyone, Since disabling the non secure port 389, I need to change the "User DS" setting of the admin server. I can do it fine with the GUI in the tab "User DS" and set my User Directory settings. However, I can't find which configuration file or ldap entry I need to modify to set it through command line; I need to script it. Could you advise me how to change it ? Regards, Nicolas Martin