This file is indexed.

prerm is in openjdk-6-jre 6b41-1.13.13-0ubuntu0.12.04.1.

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

basedir=/usr/lib/jvm/java-6-openjdk-amd64
jre_tools='policytool'

if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]; then
    for i in $jre_tools; do
	update-alternatives --remove $i $basedir/jre/bin/$i
    done
fi