This file is indexed.

/usr/share/initramfs-tools/scripts/casper-bottom/45jackd2 is in casper 1.340.

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

PREREQ=""
DESCRIPTION="Configuring jackd2..."

prereqs()
{
	echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
       prereqs
       exit 0
       ;;
esac

. /scripts/casper-functions

log_begin_msg "$DESCRIPTION"

if fgrep -qs jackd/tweak_rt_limits /tmp/casper-preseed.log; then
	# So far this has only been set in casper's environment.  Copy it
	# over to the master files early so that dpkg-reconfigure in /root
	# can see it.
	fgrep jackd/tweak_rt_limits /tmp/casper-preseed.log | \
		chroot /root debconf-set-selections

	casper-reconfigure /root jackd2
fi

log_end_msg