Usage: 
  byfn.sh <mode> [-c <channel name>] [-t <timeout>] [-d <delay>] [-f <docker-compose-file>] [-s <dbtype>] [-l <language>] [-o <consensus-type>] [-i <imagetag>] [-a] [-n] [-v]
    <mode> - one of 'up', 'down', 'restart', 'generate' or 'upgrade'
      - 'up' - bring up the network with docker-compose up
      - 'down' - clear the network with docker-compose down
      - 'restart' - restart the network
      - 'generate' - generate required certificates and genesis block
      - 'upgrade'  - upgrade the network from version 1.3.x to 1.4.0
    -c <channel name> - channel name to use (defaults to "mychannel")
    -t <timeout> - CLI timeout duration in seconds (defaults to 10)
    -d <delay> - delay duration in seconds (defaults to 3)
    -f <docker-compose-file> - specify which docker-compose file use (defaults to docker-compose-cli.yaml)
    -s <dbtype> - the database backend to use: goleveldb (default) or couchdb
    -l <language> - the chaincode language: golang (default) or node
    -o <consensus-type> - the consensus-type of the ordering service: solo (default), kafka, or etcdraft
    -i <imagetag> - the tag to be used to launch the network (defaults to "latest")
    -a - launch certificate authorities (no certificate authorities are launched by default)
    -n - do not deploy chaincode (abstore chaincode is deployed by default)
    -v - verbose mode
  byfn.sh -h (print this message)

Typically, one would first generate the required certificates and 
genesis block, then bring up the network. e.g.:

	byfn.sh generate -c mychannel
	byfn.sh up -c mychannel -s couchdb
        byfn.sh up -c mychannel -s couchdb -i 1.4.0
	byfn.sh up -l node
	byfn.sh down -c mychannel
        byfn.sh upgrade -c mychannel

Taking all defaults:
	byfn.sh generate
	byfn.sh up
	byfn.sh down