How do I view 'git diff' output with my preferred diff tool/ viewer?

Question

When I type git diff, I want to view the output with my visual diff tool of choice (SourceGear \"diffmerge\" on Windows). How do I configure git to do this?

Answer 1

If you're on a Mac and have XCode, then you have FileMerge installed. The terminal command is opendiff, so you can just do git difftool -t opendiff