This file is indexed.

/var/yp/nicknames is in nis 3.17-32ubuntu6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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passwd		passwd.byname
group		group.byname
networks	networks.byaddr
hosts		hosts.byname
protocols	protocols.bynumber
services	services.byname
aliases		mail.aliases
ethers		ethers.byname