This file is indexed.

/sbin/acpi_available is in powermgmt-base 1.31+nmu1.

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 -e

if [ "$@" ]; then
  echo "Usage: $0"
  exit 2
fi

if [ -d /proc/acpi/ ]; then
  exit 0
fi

exit 1