This file is indexed.

/usr/share/ircd-hybrid/help/knock is in ircd-hybrid 1:8.2.21+dfsg.1-1.

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

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KNOCK <channel>

KNOCK requests access to a channel that
for some reason is not open.

KNOCK cannot be used if you are banned, the
channel is +p, or it is open.