This file is indexed.

/lib/systemd/system/knockd.service is in knockd 0.7-1.

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

The actual contents of the file can be viewed below.

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[Unit]
Description=Port-Knock Daemon
After=network.target
Documentation=man:knockd(1)

[Service]
EnvironmentFile=-/etc/default/knockd
ExecStart=/usr/sbin/knockd $KNOCKD_OPTS
ExecReload=/bin/kill -HUP $MAINPID
KillMode=mixed
SuccessExitStatus=0 2 15
ProtectSystem=full
CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN