anchor.diff:      ].
   node_usage() ->
       ["vmq-admin node <sub-command>\n\n",
  -     "  administrate this VerneMQ cluster node.\n\n",
  +     "  administrate this VerneMQ node.\n\n",
        "  Sub-commands:\n",
        "    start       Start the server application\n",
  -     "    stop        Stop the server application\n",
  +     "    stop        Stop the server application\n\n",
  +     "  Use --help after a sub-command for more details.\n"
  +    ].
  +
  +cluster_usage() ->
  +    ["vmq-admin cluster <sub-command>\n\n",
  +     "  administrate this VerneMQ cluster membership.\n\n",
  +     "  Sub-commands:\n",
        "    status      Prints cluster status information\n",
        "    join        Join a cluster\n",
  -     "    leave       Leave the cluster\n",
  -     "    upgrade     Upgrade a cluster node\n\n",
  +     "    leave       Leave the cluster\n\n",
        "  Use --help after a sub-command for more details.\n"
       ].
   
  
positive.code:     ["vmq-admin node start\n\n",
       "  Starts the server application within this node. This is typically\n",
       "  not necessary since the server application is started automatically\n",
       "  when starting the node.\n"
      ].
  
  stop_usage() ->
      ["vmq-admin node stop\n\n",
       "  Stops the server application within this node. This is typically\n\n"
      ].
  
  join_usage() ->
      ["vmq-admin node join discovery-node=<Node> [--node-type=disc|ram]\n\n",
       "  Make the node join a cluster. The node will be reset automatically\n",
       "  before we actually cluster it. The discovery node provided will be\n",
       "  used to find out about the nodes in the cluster.\n\n"
      ].
  
  leave_usage() ->
      ["vmq-admin node leave\n\n",
       "  Leaves this cluster.\n\n"
      ].
  
  
negative.code: 
  
  vmq_cluster_join_cmd() ->
      Cmd = ["vmq-admin", "cluster", "join"],
      KeySpecs = [{'discovery-node', [{typecast, fun(Node) ->
                                                         list_to_atom(Node)
                                                 end}]}],
  