This file is indexed.

prerm is in hicolor-icon-theme 0.12-1ubuntu2.

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" = "remove" ] || [ "$1" = "deconfigure" ] ; then
  rm -f /usr/share/icons/hicolor/icon-theme.cache
fi