public class killno implements CommandExecutor, Listener {

	@EventHandler
     public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {

    	 Player player = (Player) sender;

		       if(args.length == 0) {
    				       if(commandLabel.equalsIgnoreCase("kill")) {

    					    	   player.sendMessage(ChatColor.DARK_RED + "Usage: /kill <Playername>");

    					    	   return true;

    				  }} else
    					  if (args.length == 1) {
    						  if(args[1].equalsIgnoreCase("PoisonNightBlade")){

      						player.sendMessage("tell me it says this");

    						  return true;

    					  }

    				       return true;
	}

			return true;
			}}