with sub-Dockerfiles ! USAGE: docker-assembler [global options] command [command options] [arguments...] ! VERSION: 0.1.0 ! COMMANDS: create Setup docker assembler project. add Add new sub-Dockerfile and its directory. build Build a Docker image with specified sub-Dockerfiles. help, h Shows a list of commands or help for one command ! GLOBAL OPTIONS: --version, -v print the version --help, -h show help