This file is indexed.

prerm is in nethack-x11 3.4.3-15build1.

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" = remove ]; then
    update-alternatives --remove nethack /usr/lib/games/nethack/nethack-x11.sh
    update-alternatives --remove nethack /usr/lib/games/nethack/nethack-x11-tty.sh
fi