else if (mainArg.equalsIgnoreCase("remove"))
this.cmd = new RemoveCmd(sender, args);
else if (mainArg.equalsIgnoreCase("sell"))
this.cmd = new SellCmd(sender, args);
else if (mainArg.equalsIgnoreCase("exchange"))
this.cmd = new ExchangeCmd(sender, args);
//Management commands
else if (mainArg.equalsIgnoreCase("add"))
this.cmd = new AddCmd(sender, args);
else if (mainArg.equalsIgnoreCase("get"))