Global git config

.gitconfig

[user]
	name = Martin Bokman
	email = martin@bokman.org
[core]
	excludesfile = /Users/mbokman/.gitignore_global
	editor = /usr/local/bin/mate -w
#	always commit unix line endings (http://help.github.com/line-endings/)
	autocrlf = input
[color]
	diff = auto
	status = auto
	branch = auto
	interactive = auto

.gitignore_global

# ~/.gitignore_global
#

# Mac stuff
.DS_Store

# Sublime Text project and workspace files
*.sublime-project
*.sublime-workspace

# ignore copied svn files
.svn/*

git config --global --add user.name "Martin Bokman"
git config --global --add user.email martin@bokman.org

git config --global core.excludesfile ~/.gitignore_global

git config --global --list

I think non-global settings can be done by replacing --global with --file .gitconfig.

git init
git add .

git commit -m "Initial commit."