How to install most recent git using homebrew

update-git.sh

# install brew if not installed
which brew > /dev/null || ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"

# update brew package list
brew update

# install git from brew
[[ -x /usr/local/bin/git ]] || brew install git

# if git is installed, upgrade it
brew upgrade git

# Ensure /usr/local/bin is before anything else on your path
echo 'export PATH=/usr/local/bin:$PATH' >> ~/.bash_profile