This file is indexed.

prerm is in gfortran 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 -e

if [ $1 != "upgrade" ]; then
    update-alternatives --remove f95 /usr/bin/gfortran

    update-alternatives --remove f77 /usr/bin/gfortran
fi