Running commands or scripts in VM guest is something that has been done with vCO for quite a while using different mechanisms. A popular way was to use the VIX plug-in for vCO. This plug-in is not needed anymore since the VIX functionality is part of the vCenter API since vCenter 5.0 and there are guest operations workflows to copy a script and run it into a VM guest OS since vCO 5.
We are proud to announce that vCO Team members and VMware labs today released a vCO (4.1) VIX plug-in for the VIX API version 1.10. If you wonder what VIX is here is an extract of the VIX landing page: "The VIX API allows you to write programs and scripts that automate virtual machine operations, as well as the guests within virtual machines. This API is high-level, easy to use, and practical for both script writers and application programmers.