This file is indexed.

prerm is in libblas-dev 3.7.1-4ubuntu1.

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 --remove libblas.so-x86_64-linux-gnu \
                        /usr/lib/x86_64-linux-gnu/blas/libblas.so
fi



exit 0