This file is indexed.

preinst is in libatlas3-base 3.10.3-5.

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 3.10.3-4~
then
    update-alternatives --remove libblas.so.3 /usr/lib/atlas-base/atlas/libblas.so.3
    update-alternatives --remove liblapack.so.3 /usr/lib/atlas-base/atlas/liblapack.so.3
fi



exit 0