func Cmd() *cobra.Command {
	configCmd := &cobra.Command{
		Use:   "config SUBCOMMAND",
		Short: "Configure istioctl defaults",
		Args:  cobra.NoArgs,
		Example: `  # list configuration parameters
  istioctl experimental config list`,
	}
	configCmd.AddCommand(listCommand())
	return configCmd
}

func listCommand() *cobra.Command {
	listCmd := &cobra.Command{
		Use:   "list",

  // "Reject" means that requests that can not be executed upon arrival
  // are rejected.
  // Required.
  // +unionDiscriminator
  optional string type = 1;

  // `queuing` holds the configuration parameters for queuing.
  // This field may be non-empty only if `type` is `"Queue"`.
  // +optional
  optional QueuingConfiguration queuing = 2;
}

  // "Reject" means that requests that can not be executed upon arrival
  // are rejected.
  // Required.
  // +unionDiscriminator
  optional string type = 1;

  // `queuing` holds the configuration parameters for queuing.
  // This field may be non-empty only if `type` is `"Queue"`.
  // +optional
  optional QueuingConfiguration queuing = 2;
}

const (
	// Location to read istioctl defaults from
	defaultIstioctlConfig = "$HOME/.istioctl/config.yaml"
)

const (
	FlagCharts = "charts"
)

// ConfigAndEnvProcessing uses spf13/viper for overriding CLI parameters
func ConfigAndEnvProcessing() error {
	configPath := filepath.Dir(root.IstioConfig)
	baseName := filepath.Base(root.IstioConfig)
	configType := filepath.Ext(root.IstioConfig)

These rules are expressed in code in the
[name](https://github.com/istio/operator/blob/e9097258cb4fbe59648e7da663cdad6f16927b8f/pkg/name/name.go#L131) package.

### K8s settings

Rather than defining selective mappings from parameters to fields in K8s resources, the `IstioOperatorSpec` API
contains a consistent K8s block for each Istio component. The available K8s settings are defined in