Ex4

int rec(int process, int avancement, int argc){
    if (avancement == argc) return argc;

    if (process < MAXFILS) {
        if (fork() == 0){
            avancement = rec(process+1, avancement, argc);
            if (avancement == argc) return argc;
            else{
                execl("/bin/grep","grep",argv[1],argv[avancement],NULL);
                return avancement+1;
            }
        }




    }

    else return avancement;

}