I am trying to setup my XBMC music and used a program called puddletag to organize all the filenames and ID3 tags. The problem is puddletag erased all the file extensions and now XBMC won't recognize the files as music. I need to add .mp3 to all 1000 of my music files. I realize I can simply rename them with the extension included but I didn't know if there was a way through Ubuntu or puddletag (if someone is familiar) to do this to all selected files.
I finally figured it out. Go to that directory and enter this code. It will place .mp3 after everything regardless if it's an mp3 or not.