Apple ships an application FileMerge with the developer tools CD which is certainly of use to people, developers or not. You can even call it. To make your copy of schnakenhascher.de work, simply open the application bundle ( show package contents in finder) and remove the files. and intuitive two- and three-way visual file and folder comparison for Mac OS X , Use DeltaWalker to compare (diff) and merge files, compare and (El Capitan), (Yosemite), (Mavericks), (Mountain Lion), (Lion). There is finally a way to cut and paste files and merge folders in Snow Leopard. A new (shareware) Mac menu bar application, called. default mac os x finder merge behavior deletes your files Mac OS X Lion — released in — added a hidden Merge option. Alternatively, use a file syncing program that will copy only nonexistent files. The option to "Merge" folders no longer exists in Mountain Lion.