This file is indexed.

prerm is in libopenblas-base 0.2.18-1ubuntu1.

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.3 \
    /usr/lib/openblas-base/libblas.so.3

    update-alternatives --remove liblapack.so.3 \
        /usr/lib/openblas-base/liblapack.so.3
fi



exit 0