This file is indexed.

preinst is in cron 3.0pl1-128ubuntu2.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e

# /etc/init.d/cron symlink gets replaced with a real file on upgrade
if [ "$1" = upgrade ] && [ -L /etc/init.d/cron ]; then
    echo "Removing obsolete /etc/init.d/cron symlink..."
    rm /etc/init.d/cron
fi