Shipshape has been tested on Ubuntu (>=14.04) and Debian unstable, but should work on other Linux distributions.
apt-get install docker-engine works for most machines, but complete
instructions are available.
Make sure you can run docker without sudo by adding your user to the docker group. After you do this, log out of your terminal and log in again.
sudo usermod -a -G docker $USER
wget https://storage.googleapis.com/shipshape-cli/shipshape
chmod 555 shipshape
sudo mv shipshape /usr/bin/
That's it! You can now run shipshape with
shipshape <directory>