Code:
switch(i)
{ 
        case 0: IScd(argc, argv); break;
        case 1: IShelp();break;
        case 2: kill_main(argc, argv); break;
        case 3: ISls(args); break;
        case 4: ISps(); break;
        case 5: ISpwd(); break;
        default: break;
}
perhaps?