This file is indexed.

preinst is in update-motd 3.5-0ubuntu1.

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 -e

PKG="update-motd"

# Remove a no-longer used conffile
rm_conffile() {
	CONFFILE="$1"
	if [ -e "$CONFFILE" ]; then
		md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
		old_md5sum="`sed -n -e \"/^Conffiles:/,/^[^ ]/{\\\\' $CONFFILE'{s/.* //;p}}\" /var/lib/dpkg/status`"
		if [ "$md5sum" != "$old_md5sum" ]; then
			echo "Obsolete conffile $CONFFILE has been modified by you."
			echo "Saving as $CONFFILE.dpkg-bak ..."
			mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
		else
			echo "Removing obsolete conffile $CONFFILE ..."
			rm -f "$CONFFILE"
		fi
	fi
}

case "$1" in
	install|upgrade)
		# Purge unneeded a) init script, b) cronjobs, c) inotify configuration
		update-rc.d -f $PKG remove
		rm_conffile /etc/init.d/$PKG
		rm_conffile /etc/cron.d/$PKG
		rm_conffile /etc/$PKG/iwatch.xml
		# Reset the current motd to the bare skeleton established by bootmisc.sh
		uname -snrvm > /var/run/motd
		cat /etc/motd.tail 2>/dev/null >> /var/run/motd || true
	;;
esac