This file is indexed.

prerm is in icedtea-8-plugin 1.6.2-3ubuntu1.

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 -e

browser_dirs="mozilla"
PLUGIN=IcedTeaPlugin.so
PLUGINPTH=/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/$PLUGIN

for browser_dir in $browser_dirs; do
    if [ $browser_dir = xulrunner-addons ]; then
        browser=xulrunner-1.9
    else
        browser=$browser_dir
    fi
    update-alternatives --quiet --remove \
	$browser-javaplugin.so \
	$PLUGINPTH
done