This file is indexed.

postrm is in debian-archive-keyring 2012.4.

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" = "purge" ]
then
  # Remove the symlink
  rm -f /etc/apt/trusted.gpg.d/debian-archive-keyring.gpg
fi