How do I remove all files that match a pattern?
Use the find command (with care!)
find . -name '*.orig' #-delete
I've commented out the delete command but once you're happy with what it's matching, just remove the # from the line and it should delete all those files.
"find" has some very advanced techniques to search through all or current directories and rm files.
find ./ -name ".orig" -exec rm -rf {} \;