The first thing comes to my mind is when do you see this " < "? Job submission? Or during system configuration?
If the latter, you are advised to look at automated configuration tool such as Puppet, Chef, Salt, or Ansible. I use the last one and it is very easy to setup. All of them support "master-slave" pull mode, which means periodically they can contact each other find out whether the underlying system requires update.
Master: think of workstation, has a damon contacting other nodes (condor master, condor slaves) periodically
Slaves: also has daemon that answers question/ask question.
Ansible, which I recommend, by default does not run in this pull mode. It's a push, but Ansible supports pull.
Right now, push is good enough for my lab's setup. Every week I go on the temrinal, type in a command and the command will fire up multiple SSH connections to multiple machines, and "reconfigure" each machine. Note reconfiguration has to satisfy idempotence law. If condor version == the one in the update script, no change. If < update.
IIs this what you are looking for?