Merge two folders, without overwriting any files

I use an alternative manager http://www.binarynights.com/ as a workaround.

If you copy folders there, Forklift will ask you if you want to merge them or replace. Replace option works how you would expect.

However, when you move folders, the replace is the only option.

I'm stumped as to why cp is behaving this way if there's no alias involved. However, there is a quick-dirty-and-dangerous utility provided for this exact situation: yes. You can use it to pipe a continuous stream of affirmatives into any command that gives you confirmation prompts (you can use it to send any text, but the default is "y").

yes | cp foo bar will execute the cp command and bypass all confirmation prompts.