howto/cumin.md

@@ -66,6 +66,14 @@ will run the same command only on physical hosts:
 
     cumin 'F:virtual=physical' uptime
 
+You can invert a condition by placing 'not ' in front of it. Also for facts,
+you can retrieve structured facts using puppet's dot notation (e.g.
+'networking.fqdn' to check the fqdn fact). Using these two techniques the
+following example will run a command on all hosts that have not yet been
+upgraded to bookworm:
+
+    cumin 'not F:os.distro.codename=bookworm' uptime
+
 Just check the monitoring server:
 
     cumin 'R:class=roles::monitoring' uptime