This file is indexed.

postrm is in nagios-nrpe-plugin 3.2.1-1ubuntu1.

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
	test -d /var/lib/nagios && rmdir /var/lib/nagios || true #ignore non-failure errors 
fi