regctl help
Help provides help for any command in the application. Simply type regctl help [path to command] for full details.
regctl help [command]
      --host stringArray     Registry hosts to add (reg=registry,user=username,pass=password,tls=enabled)
      --logopt stringArray   Log options
      --user-agent string    Override user agent
  -v, --verbosity string     Log level (trace, debug, info, warn, error) (default "WARN")