The output from running that command indicates "Now run the resulting image, making sure that you set AWS_S3_BUCKET,
AWS_ACCESS_KEY, and AWS_SECRET_KEY environment variables: docker run -e AWS_S3_BUCKET=get-staging.docker.io " ... 

I suspect these are just instructions to the dotCloud folks who push binary images to get-staging.docker.io. Should there be a note in the docs that it is ok to ignore this output from the script?