void main() {
    char command[100];
    printf("Welcome to MyOS! Type 'help' for a list of commands.\n");
    while (1) {
        printf("> ");
        gets(command);
        if (strcmp(command, "help") == 0) {
            printf("Available commands: help, exit\n");
        } else if (strcmp(command, "exit") == 0) {
            break;
        } else {
            printf("Unknown command: %s\n", command);
        }
    }
}