This file is indexed.

prerm is in courier-base 0.78.0-2ubuntu2.

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" -o "$1" = "remove" ]; then
  for binary in maildirmake deliverquota makedat; do
      update-alternatives --remove $binary /usr/bin/$binary.courier
  done
  update-alternatives --remove maildir.5.gz /usr/share/man/man5/maildir.courier.5.gz
  update-alternatives --remove maildirquota.7.gz /usr/share/man/man7/maildirquota.courier.7.gz
fi