This file is indexed.

preinst is in gnome-icon-theme-full 3.4.0-0ubuntu1.

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

if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" lt-nl "3.0.0-5"; then
  update-alternatives --remove start-here.svg /usr/share/icons/gnome/scalable/places/swirl-foot.svg
fi