gistfile1.txt

#!/bin/sh
rm /tmp/hosts.cfg
puppet apply -e 'nagios_host { "foo": target => "/tmp/hosts.cfg", check_command => "a_mistake" }'
grep check_command /tmp/hosts.cfg


# Not what we want - the resource doesn't change as undef doesn't make it
# through to the type to clear the value
puppet apply -e 'nagios_host { "foo": target => "/tmp/hosts.cfg", check_command => undef }'
grep check_command /tmp/hosts.cfg


# Not what we want - absent setting to a value
puppet apply -e 'nagios_host { "foo": target => "/tmp/hosts.cfg", check_command => "absent" }'
grep check_command /tmp/hosts.cfg