This file is indexed.

/usr/share/irssi/help/oper is in irssi 0.8.15-5ubuntu3.

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

The actual contents of the file can be viewed below.

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OPER %|[<nick> [<password>]]

Gives you operator privileges if the correct nickname and password are given.  If password is not given, you will be prompted for one.  If no nickname is given, your current nickname will be used.

See also: KILL, DIE