This file is indexed.

prerm is in libtxc-dxtn-s2tc0 0~git20131104-1.1.

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

update-alternatives --remove \
	libtxc-dxtn-x86_64-linux-gnu /usr/lib/x86_64-linux-gnu/libtxc_dxtn_s2tc.so.0