Yes, it is a very useful tool. Used to do very similar when I worked as a sysadmin in larger infrastructures that largely get managed over ssh. A surprisingly l

Yes, it is a very useful tool. Used to do very similar when I worked as a sysadmin in larger infrastructures that largely get managed over ssh. A surprisingly large number of infrastructures have keys setup for individual sysadmins across all hosts, through straight sshd user auth. One problem this helps with is getting into older servers with an unknown password and can't be rebooted for business reasons. At some point, some person may have setup keys to that host, and the only way to find out which is to basically try all hosts and all users. So having something that snakes through an infrastructure like this would help get into that host.