code: func DefaultSubCommandRun(out io.Writer) func(c *cobra.Command, args []string) {
  	return func(c *cobra.Command, args []string) {
  		c.SetOutput(out)
  		RequireNoArguments(c, args)
  		c.Help()
  		CheckErr(ErrExit)
  	}
  }
docs: // DefaultSubCommandRun prints a command's help string to the specified output if no
  // arguments (sub-commands) are provided, or a usage error otherwise.