This file is indexed.

prerm is in xscreensaver 5.36-1ubuntu1.

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

case "$1" in 
  remove|purge)
	killall -q /usr/bin/xscreensaver || true
	;;
esac