Was just about to write that. 🙂
You can, of course, as non-superadmin run the print command for all individual users, and multiprocess that into a single list.
But, as clearly seen in the wiki, there are a number of commands run with Client Access, meaning you have to actually have the necessary admin rights (which doesn't always mean superadmin), and other commands with Service Account access.
When run with Service Account access, then you always have to provide the username of the user you wish to act on.
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