else if (mainArg.equalsIgnoreCase("help"))
this.cmd = new HelpCmd(sender, args);
else if (mainArg.equalsIgnoreCase("about"))
this.cmd = new AboutCmd(sender, args);
else if (mainArg.equalsIgnoreCase("version"))
this.cmd = new VersionCmd(sender, args);
//Customer commands
else if (mainArg.equalsIgnoreCase("last"))
this.cmd = new LastCmd(sender, args);
else if (mainArg.equalsIgnoreCase("undo"))