This file is indexed.

prerm is in openjdk-8-jdk-headless 8u162-b12-1.

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

set -e

jdk_hl_tools='idlj jdeps wsimport jinfo jsadebugd native2ascii jstat javac javah jstack jrunscript javadoc javap jar xjc schemagen jps extcheck rmic jstatd jmap jhat jdb serialver wsgen jcmd jarsigner'
basedir=/usr/lib/jvm/java-8-openjdk-amd64


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