Getting URNs of Pulumi resources

This is another Pulumi related entry mainly intended to help future-me. If you wish to update one or several selected Pulumi objects instead of the entire stack, you can specify the URN of each object to update, with the --update argument to pulumi update. It wasn’t obvious how to get the URNs - a touch of googling showed me the -u argument to pulumi stack:

pulumi stack -u