This file is indexed.

prerm is in rxvt-unicode 9.22-3.

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 rxvt /usr/bin/urxvt
    update-alternatives --remove x-terminal-emulator /usr/bin/urxvt
fi