This file is indexed.

preinst is in vsftpd 2.3.5-1ubuntu2.

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
# Automatically added by dh_installinit
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/init.d/vsftpd" ] && [ ! -L "/etc/init.d/vsftpd" ]; then
		if [ "`md5sum \"/etc/init.d/vsftpd\" | sed -e \"s/ .*//\"`" != \
		     "`dpkg-query -W -f='${Conffiles}' vsftpd | sed -n -e \"\\\\' /etc/init.d/vsftpd '{s/ obsolete$//;s/.* //p}\"`" ]
		then
			echo "Obsolete conffile /etc/init.d/vsftpd has been modified by you, renaming to .dpkg-bak"
			mv -f "/etc/init.d/vsftpd" "/etc/init.d/vsftpd.dpkg-bak"
		else
			rm -f "/etc/init.d/vsftpd"
		fi
	fi
fi
# End automatically added section