How to update ribbon diff xml multiple times using code

Hello Team, 

I have to add a button to ribbon using code. As of now only way what I can think of is export a solution & change the customization file with updated ribbon diff & import it back to the CRM or by using database (I don't want to use this option at all). What I want to know is there any blog or link in msdn which tells about the steps. 

How about using power shell would that be a viable solution because, here I want to update the ribbon diff xml file not replace it. 

Thanks in advance.