tplinux2

2.2)

1)$ find /usr -type f -exec cat {} \; | wc -l > res.txt &
  $ kill -stop -groupprocessnum
  $ kill -cont -groupprocessnum

2)$ ps fUosms12

3) père : bash
   grandpère : sshd osms12@pts/12

4) OK

5) find /usr -type d -print | tee res.txt | wc -l

6) grep --color -E "^.*home.*$" /etc/* | more

7)$ tar zcf rep1.tgz rep1
  $ tar zxf rep1.tgz

8) OK

9) ### envoyer ###
   cat rep1.tgz > /tmp/jannouletube

   ### recevoir ###
   tar -zxf /tmp/jannouletube

10)

### Code ###

    #include <stdio.h>

    int fibo();

    int main(){
        int j = 0;
        while(j < 0xFFFFFFFF){
            int a = fibo(10);
            j++;
        }
        j = 0;
        while(j < 0xFFFFFFFF){
            int a = fibo(10);
            j++;
        }
        j = 0;
        while(j < 0xFFFFFFFF){
            int a = fibo(10);
            j++;
        }
        j = 0;
        while(j < 0xFFFFFFFF){
            int a = fibo(10);
            j++;
        }
    }

    int fibo(int n){
        int x = 1;
        int y = 1;
        if(n <= 2) return x;
        else{
            int i = 3;
            while(i <= n){
                int temp = x + y;
                x = y;
                y = temp;
                i++;
            }
            return y;
        }
    }

############

12)

### Code ###

    #include <stdio.h>
    #include <sys/types.h>
    #include <sys/unistd.h>
    #include <sys/wait.h>

    int fibo(int n);

    int main(){
        int pid = fork();
        if(pid == 0) { // fils
            printf("Start fils.\n");
            int j = 0;
            while(j < 0xFFF){
                int a = fibo(10);
                j++;
            }
            printf("Fin fils.\n");
            sleep(1);
        } else { // père
            printf("Start père.\n");
            wait(&pid);
            printf("Fin père.\n");
        }

    }

    int fibo(int n){
        int x = 1;
        int y = 1;
        if(n <= 2) return x;
        else{
            int i = 3;
            while(i <= n){
                int temp = x + y;
                x = y;
                y = temp;
                i++;
            }
            return y;
        }
    }

############

   $ ps fU osms12

13) $ find / -name "bash*" |& less           (|& = toutes les sorties)

14) find / -name "bash*" 2>&1 | less         (on redirige la sortied'erreur standard dans la sortie standard et on pipe vers less)

15) bash1$ mkfifo cmdtube
    bash1$ cat > cmdtube
    bash2$ exec < cmdtube
    bash1$ *entrer commandes*

16) bash1$ cat > pipe
    bash2$ exec < pipe >/dev/pts/9
    bash1$ *entrer commandes*