This file is indexed.

/etc/cron.weekly/0anacron is in anacron 2.3-23.

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
#
# anacron's cron script
#
# This script updates anacron time stamps. It is called through run-parts
# either by anacron itself or by cron.
#
# The script is called "0anacron" to assure that it will be executed
# _before_ all other scripts.

test -x /usr/sbin/anacron || exit 0
anacron -u cron.weekly