How do I make Git use the editor of my choice for commits?

Question

I would prefer to write my commit messages in Vim, but it is opening them in Emacs.

How do I configure Git to always use Vim? Note that I want to do this globally,

Answer 1

And if you are working with designers using the command line then Pico, and dont know short cuts ;)

git config --global core.editor "pico"

Or

export VISUAL=pico
export EDITOR=pico