This file is indexed.

preinst is in libasound2-dev 1.1.0-0ubuntu1.

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

DOCDIR=/usr/share/doc/libasound2-dev

if [ -L $DOCDIR ]; then
    rm $DOCDIR
fi