This file is indexed.

prerm is in tk8.4 8.4.19-4.

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 wish /usr/bin/wish8.4
fi