This file is indexed.

prerm is in icedtea-netx 1.6.2-3.1ubuntu3.

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

base6dir=/usr/lib/jvm/java-6-openjdk-amd64
base7dir=/usr/lib/jvm/java-7-openjdk-amd64
base8dir=/usr/lib/jvm/java-8-openjdk-amd64
tools='javaws itweb-settings policyeditor'

if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]; then
    for i in $tools; do
        update-alternatives --remove $i $base6dir/jre/bin/$i
    done
    for i in $tools; do
        update-alternatives --remove $i $base7dir/jre/bin/$i
    done
    for i in $tools; do
        update-alternatives --remove $i $base8dir/jre/bin/$i
    done
fi