This file is indexed.

prerm is in cpp 4:4.6.3-1ubuntu5.

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

if [ "$1" != upgrade ]; then
    update-alternatives --quiet --remove cpp /usr/bin/cpp
fi