Install this. Its a fuzzy-completer for the terminal, used by a couple of the utilities... https://github.com/junegunn/fzf#installation
# This could be your .bashrc
export DOCKERCLOUD_USER='ponelat'
export DOCKERCLOUD_NAMESPACE='some-clever-bear'
export DOCKERCLOUD_APIKEY="secretsecret"
These are used by the utilities for access control
PS: The DOCKERCLOUD_NAMESPACE is used if you want access to your organization's docker cloud.
if ponelat were your name... To get an API key... go to https://cloud.docker.com and under Settings, you'll see a section on API keys in the left pane. Create a key, there aren't any scope it'll give you full access.
Happy figuring-out-what-they did!