This file is indexed.

/lib/systemd/system-shutdown/nutshutdown is in nut-server 2.7.1-1ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
/sbin/upsmon -K >/dev/null 2>&1 && /sbin/upsdrvctl shutdown