Despite AFS having been out of service for a number of years, our lab still has some dependencies on it. One of these is that we use AFS uids to keep local uids in sync (since there’s a policy that our local uids have to match our AFS uids even if we aren’t using the AFS filesystem actively in any way).
A side effect of this is that you’ll sometimes see uids on NFS mounted storage that aren’t in the local /etc/passwd file. Here’s an example of how to look these beasties up:
$ /@sys/supp/bin/afs/pts examine pjoot Name: pjoot, id: 6415, owner: system:administrators, creator: admroot, membership: 6, flags: S----, group quota: 17. $ /@sys/supp/bin/afs/pts examine 6415 Name: pjoot, id: 6415, owner: system:administrators, creator: admroot, membership: 6, flags: S----, group quota: 17.