Installing on Mac OS X

If you're using homebrew, it's simple:

$ brew install git-flow

If you're using MacPorts, it's simple, too:

$ port install git-flow

Even using wget its a one line effort.

wget --no-check-certificate -q -O - https://github.com/nvie/gitflow/raw/develop/contrib/gitflow-installer.sh | sudo bash

wget: command not found? curl is only two lines.

curl -L -O https://raw.github.com/nvie/gitflow/develop/contrib/gitflow-installer.sh
sudo bash gitflow-installer.sh

Installing on Ubuntu

$ apt-get install git-flow

Installing on Windows

For Windows users who wish to use the automated install, it is suggested that you install Cygwin first to install tools like git, util-linux and wget(with those three being packages that can be selected during installation). Then simply run this command from a Cygwin shell in your $HOME:

$ wget -q -O - --no-check-certificate https://github.com/nvie/gitflow/raw/develop/contrib/gitflow-installer.sh | bash