This file is indexed.

preinst is in libopenblas-dev 0.2.20+ds-4.

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

# Cleanup pre-multiarch alternative
if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" lt 0.2.20+ds-3~
then
    update-alternatives --remove libblas.so /usr/lib/openblas-base/libblas.so
    update-alternatives --remove liblapack.so /usr/lib/openblas-base/liblapack.so
fi



exit 0