This file is indexed.

prerm is in perl 5.14.2-21+deb7u3.

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

if [ "$1" != upgrade ]
then
    update-alternatives --remove rename /usr/bin/prename
fi

exit 0