$ zeek-client --help
usage: zeek-client [-h] [-c FILE] [--controller HOST:PORT]
                   [--set SECTION.KEY=VAL] [--quiet | --verbose] [--version]
                   {deploy,deploy-config,get-config,get-id-value,get-instances,get-nodes,monitor,restart,stage-config,show-settings,test-timeout}
                   ...

A Zeek management client

options:
  -h, --help            show this help message and exit
  -c FILE, --configfile FILE
                        Path to zeek-client config file. (Default:
                        /usr/local/zeek/etc/zeek-client.cfg)
  --controller HOST:PORT
                        Address and port of the controller, either of which
                        may be omitted (default: 127.0.0.1:2149)
  --set SECTION.KEY=VAL
                        Adjust a configuration setting. Can use repeatedly.
                        See show-settings.
  --quiet, -q           Suppress informational output to stderr.
  --verbose, -v         Increase informational output to stderr. Repeat for
                        more output (e.g. -vvv).
  --version             Show version number and exit.

commands:
  {deploy,deploy-config,get-config,get-id-value,get-instances,get-nodes,monitor,restart,stage-config,show-settings,test-timeout}
                        See `zeek-client <command> -h` for per-command usage
                        info.
    deploy              Deploy a staged cluster configuration.
    deploy-config       Upload a cluster configuration and deploy it.
    get-config          Retrieve staged or deployed cluster configuration.
    get-id-value        Show the value of a given identifier in Zeek cluster
                        nodes.
    get-instances       Show instances connected to the controller.
    get-nodes           Show active Zeek nodes at each instance.
    monitor             For troubleshooting: do nothing, just report events.
    restart             Restart cluster nodes.
    stage-config        Upload a cluster configuration for later deployment.
    show-settings       Show zeek-client's own configuration.
    test-timeout        Send timeout test event.

environment variables:

    ZEEK_CLIENT_CONFIG_FILE:      Same as `--configfile` argument, but lower precedence.
    ZEEK_CLIENT_CONFIG_SETTINGS:  Same as a space-separated series of `--set` arguments, but lower precedence.