Check out MacMost Now 148: Merging Folders at YouTube for closed captioning and more options.
Show notes: The link to download XCode is http://developer.apple.com/tools/xcode/. You can read all about the Terminal ditto command at this official help page: http://developer.apple.com/documentation/Darwin/Reference/ManPages/man1/ditto.1.html. You can get File Synchronization here: http://nemesys2.dyndns.org:8080/.
Very informative and well presented. Just what I was looking for. Many thanks!
But what if the files are the same name? The first two options don't work. And unfortunately I don't have enough hard drive space for the 3rd.
Also what if the files have subfolders? And what if some of those subfolders have the same name, but different contents?
Can't an app ask the system to look at two file structures, and merge the individual files in folders that share a name?