An age-old problem and there are some simple awk/grep-based scripts to
handle the easy cases. Are there any more sophisticated tools that can
extract all non-system users and groups and then merge the result into the
password/group/shadow/gshadow files of a new server? I don't need home
directories or mbox inboxes created because I'll rsync those over once I've
created the users.
Tricky problems include merging entries for existing users and groups, and
renumbering if one is moving from a 500-based system to a 1000-based
system. (I did the latter long ago so don't need it this time.)
Red Hat's page with some simple commands to handle the easy cases:
<https://access.redhat.com/solutions/179753>
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