git gui: Possible to see which commands are executed?

Is it possible to see which commands are executed by git-gui? For an example, there's a menu item "branch -> rename". I'm not aware that such a thing as "git branch rename" exists on the command line. So git-gui must do it by other means. Is there a way to see how? (Don't stick with this example, it's a general question.) Some "--debug" or "--log" switch which logs the commands to a logfile or so? I know I could examine the sources but that's not convenient ;-)

It would be really cool when git-gui could show the command in a different window *before* it is executed. Some database frontends have an option "show SQL statement", but I think that would be demanded too much.

    Dirk