Hi, Would it be better to use http://www.rubydoc.info/gems/chef/Chef/Util/FileEdit to do the search in replace ? Currently we have a [dependency on Perl](https://github.com/rackspace-cookbooks/automatic_updates/blob/master/libraries/provider_automatic_updates_ubuntu.rb#L30-L32), the `Chef::File::FileEdit` seems to do nice stuff like backup of the file.