This file is indexed.

/etc/acpi/mutebtn.sh is in acpi-support 0.142-8.

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

test -f /usr/share/acpi-support/key-constants || exit 0

. /usr/share/acpi-support/key-constants
acpi_fakekey $KEY_MUTE