Install Git

sudo apt-get install git

Optional Setting

git config --global user.name "NAME"
git config --global user.email "EMAIL"
git config --list

Setup www-data SSH Key

sudo -u www-data ssh-keygen
sudo cat /var/www/.ssh/id_rsa.pub

Reference

• http://https://git-scm.com/book/en/v2/Getting-Started-Installing-Git