Please use `Ohai`'s built in `shell_out` function to run commands instead of Ruby's. This will make sure that stderr and stdout get captured and do not bleed out to `Ohai`'s output. See the [sysctl plugin](https://github.com/rackerlabs/ohai-plugins/blob/master/plugins/sysctl.rb#L13-L14) for an easy example of how to use this.