# Set up a repository with four commits git init -q echo "<h1>Hello world!</h1>" > index.html git add index.html git commit -q -m "First commit" echo "body {color: navy;}" > style.css git add style.css git commit -q -m "Add style.css" echo "h1 {color: teal;}" >> style.css git commit -q -am "Style the heading" echo "<p>Welcome!</p>" >> index.html git commit -q -am "Add a welcome line" git format-patch HEAD~3