This file is indexed.

prerm is in automake1.10 1:1.10.3-3.1ubuntu1.

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 -e

ver=1.10

if [ "$1" = "remove" ]; then
	update-alternatives --remove automake /usr/bin/automake-$ver
fi