This file is indexed.

preinst is in xboard 4.7.3-1.

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
# preinst to faciliate upgrades from older versions that still used
# the alternates system for accessing xaw-wrappers

set -e

if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" le "4.2.6-2.1"
then
	update-alternatives --quiet --remove \
		xboard \
		/usr/lib/games/xboard/xboard.real
fi