This file is indexed.

postinst is in cpp 4:7.3.0-3ubuntu2.

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 --install /lib/cpp cpp /usr/bin/cpp 10
fi