/var/yp/nicknames is in nis 3.17-34ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | passwd passwd.byname
group group.byname
networks networks.byaddr
hosts hosts.byname
protocols protocols.bynumber
services services.byname
aliases mail.aliases
ethers ethers.byname
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