code: func (cli *SeesawCLI) Execute(cmdline string) error {
  	cmd, subcmds, _, args := FindCommand(cmdline)
  	if cmd != nil {
  		return cmd.function(cli, args)
  	}
  	if subcmds != nil {
  		return errors.New("Incomplete command.")
  	}
  	return errors.New("Unknown command.")
  }
docs: // Execute executes the given command line.