NIS is used to share password files among a collection of machines.
This ensures all users have access to all machines and have the same
user id and group ids. The group of machines is referred to with a
domain name (nothing to do with a network domain name though). One
machine in the group must be a master server and the rest are nis
clients of that server. You can also have slave servers but we'll
ignore that one for now.
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