This file is indexed.

prerm is in swi-prolog-nox 7.2.3-2.

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

if [ "$1" != "upgrade" ]; then
    update-alternatives --remove prolog /usr/bin/swipl
fi

rm -f /usr/lib/swi-prolog/library/INDEX.pl