This file is indexed.

prerm is in nagios3-core 3.5.1-1ubuntu1.

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 -e

# we attempt to stop nagios3 twice, once in nagios3-common's prerm
# and once here.  otherwise, if nagios3+nagios3-common are being purged,
# the /usr/sbin/nagios3 binary could disappear before nagios3-common's
# prerm script runs, which would prevent it from being able to stop
# the binary.
if [ -x "/etc/init.d/nagios3" ]; then
	if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
		invoke-rc.d nagios3 stop || true
	else
		/etc/init.d/nagios3 stop || true
	fi
fi