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similarity index 100%
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diff --git a/S3T_TP_07_THREADS/Demonstrations/demo_mutex b/2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_mutex
similarity index 100%
rename from S3T_TP_07_THREADS/Demonstrations/demo_mutex
rename to 2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_mutex
diff --git a/S3T_TP_07_THREADS/Demonstrations/demo_mutex.c b/2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_mutex.c
similarity index 100%
rename from S3T_TP_07_THREADS/Demonstrations/demo_mutex.c
rename to 2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_mutex.c
diff --git a/S3T_TP_07_THREADS/Demonstrations/demo_pthread b/2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_pthread
similarity index 100%
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diff --git a/S3T_TP_07_THREADS/Demonstrations/demo_pthread.c b/2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_pthread.c
similarity index 100%
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rename to 2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_pthread.c
diff --git a/S3T_TP_07_THREADS/Demonstrations/demo_system b/2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_system
similarity index 100%
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diff --git a/S3T_TP_07_THREADS/Demonstrations/demo_system.c b/2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_system.c
similarity index 100%
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rename to 2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_system.c
diff --git a/S3T_TP_07_THREADS/Demonstrations/ds_pthread.c b/2019-2020/S3T_TP_07_THREADS/Demonstrations/ds_pthread.c
similarity index 100%
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rename to 2019-2020/S3T_TP_07_THREADS/Demonstrations/ds_pthread.c
diff --git a/S3T_TP_07_THREADS/Demonstrations/makefile b/2019-2020/S3T_TP_07_THREADS/Demonstrations/makefile
similarity index 100%
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diff --git a/S3T_TP_07_THREADS/Demonstrations/pthread10 b/2019-2020/S3T_TP_07_THREADS/Demonstrations/pthread10
similarity index 100%
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diff --git a/S3T_TP_07_THREADS/Demonstrations/pthread10.c b/2019-2020/S3T_TP_07_THREADS/Demonstrations/pthread10.c
similarity index 100%
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rename to 2019-2020/S3T_TP_07_THREADS/Demonstrations/pthread10.c
diff --git a/S3T_TP_07_THREADS/Demonstrations/pthread4 b/2019-2020/S3T_TP_07_THREADS/Demonstrations/pthread4
similarity index 100%
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diff --git a/S3T_TP_07_THREADS/Demonstrations/pthread4.c b/2019-2020/S3T_TP_07_THREADS/Demonstrations/pthread4.c
similarity index 100%
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rename to 2019-2020/S3T_TP_07_THREADS/Demonstrations/pthread4.c
diff --git a/S3T_TP_07_THREADS/thread_somme_tab_SOLUTION.c b/2019-2020/S3T_TP_07_THREADS/thread_somme_tab_SOLUTION.c
similarity index 100%
rename from S3T_TP_07_THREADS/thread_somme_tab_SOLUTION.c
rename to 2019-2020/S3T_TP_07_THREADS/thread_somme_tab_SOLUTION.c
diff --git a/S3T_TP_08_TCP-IP/DEMOS/client_tcp.c b/2019-2020/S3T_TP_08_TCP-IP/DEMOS/client_tcp.c
similarity index 100%
rename from S3T_TP_08_TCP-IP/DEMOS/client_tcp.c
rename to 2019-2020/S3T_TP_08_TCP-IP/DEMOS/client_tcp.c
diff --git a/S3T_TP_08_TCP-IP/DEMOS/demo_dialogue.c b/2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_dialogue.c
similarity index 100%
rename from S3T_TP_08_TCP-IP/DEMOS/demo_dialogue.c
rename to 2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_dialogue.c
diff --git a/S3T_TP_08_TCP-IP/DEMOS/demo_echange.c b/2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_echange.c
similarity index 100%
rename from S3T_TP_08_TCP-IP/DEMOS/demo_echange.c
rename to 2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_echange.c
diff --git a/S3T_TP_08_TCP-IP/DEMOS/demo_serveur_tcp.c b/2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_serveur_tcp.c
similarity index 100%
rename from S3T_TP_08_TCP-IP/DEMOS/demo_serveur_tcp.c
rename to 2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_serveur_tcp.c
diff --git a/S3T_TP_08_TCP-IP/DEMOS/demo_wait3.c b/2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_wait3.c
similarity index 100%
rename from S3T_TP_08_TCP-IP/DEMOS/demo_wait3.c
rename to 2019-2020/S3T_TP_08_TCP-IP/DEMOS/demo_wait3.c
diff --git a/2020-2021/S3T_TP_00_REVISIONS/Demo_make/bonjour.c b/2020-2021/S3T_TP_00_REVISIONS/Demo_make/bonjour.c
new file mode 100755
index 0000000..83d4fd2
--- /dev/null
+++ b/2020-2021/S3T_TP_00_REVISIONS/Demo_make/bonjour.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "util_afficher.h"
+ int main (int argc, char * argv[], char * envp[])
+{ 
+  if (argc != 2) {fprintf (stderr, "\nSyntaxe : %s <chaine> \n\n", argv[0]); exit (1); }
+  afficher_chaine(argv[1]);
+}
+
diff --git a/2020-2021/S3T_TP_00_REVISIONS/Demo_make/util_afficher.c b/2020-2021/S3T_TP_00_REVISIONS/Demo_make/util_afficher.c
new file mode 100755
index 0000000..51d0d0b
--- /dev/null
+++ b/2020-2021/S3T_TP_00_REVISIONS/Demo_make/util_afficher.c
@@ -0,0 +1,9 @@
+/*********************************/
+/* Specification afficher_chaine */
+/*********************************/
+#include <stdio.h>
+#include "util_afficher.h"
+void afficher_chaine (char * chaine) {
+  printf ("\n\n*** %s ! ***\n\n", chaine);
+}
+
diff --git a/2020-2021/S3T_TP_00_REVISIONS/Demo_make/util_afficher.h b/2020-2021/S3T_TP_00_REVISIONS/Demo_make/util_afficher.h
new file mode 100755
index 0000000..55ed136
--- /dev/null
+++ b/2020-2021/S3T_TP_00_REVISIONS/Demo_make/util_afficher.h
@@ -0,0 +1,5 @@
+/*********************************/
+/* Specification afficher_chaine */
+/*********************************/
+void afficher_chaine (char * chaine);
+
diff --git a/2020-2021/S3T_TP_00_REVISIONS/crash.c b/2020-2021/S3T_TP_00_REVISIONS/crash.c
new file mode 100755
index 0000000..b6b7e2b
--- /dev/null
+++ b/2020-2021/S3T_TP_00_REVISIONS/crash.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main (int argc, char * argv[], char * envp[])
+{ 
+  FILE *leFichier ;
+  int n;
+  // assert (argc == 2);
+  if (argc != 2) {fprintf (stderr, "\nSyntaxe : %s <chaine> \n\n", argv[0]); exit (1); }
+  leFichier = fopen (argv[1], "w");
+  n = fwrite ("OK !\13\10\10\10\10", strlen ("OK !\13\10\10\10\10"), 1, leFichier);
+  fclose ( leFichier); 
+ 
+  printf ("\nhello %s\n\n", argc);
+  printf ("\n\n\n Fin normale du programme\n\n");
+}
+
diff --git a/2020-2021/S3T_TP_00_REVISIONS/hello.c b/2020-2021/S3T_TP_00_REVISIONS/hello.c
new file mode 100755
index 0000000..15a71ec
--- /dev/null
+++ b/2020-2021/S3T_TP_00_REVISIONS/hello.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+int main (int argc, char * argv[], char * envp[])
+{ 
+  assert (argc == 2);
+  //if (argc != 2) {fprintf (stderr, "\nSyntaxe : %s <chaine> \n\n", argv[0]); exit (1); }
+
+  printf ("\nhello %s\n\n", argv[1]);
+}
+
diff --git a/2020-2021/S3T_TP_00_REVISIONS/processus_1.c b/2020-2021/S3T_TP_00_REVISIONS/processus_1.c
new file mode 100755
index 0000000..ed869bb
--- /dev/null
+++ b/2020-2021/S3T_TP_00_REVISIONS/processus_1.c
@@ -0,0 +1,15 @@
+/*
+	gcc processus_1.c
+	Exemple : ./a.out un deux trois
+*/
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char * argv[]){
+	int i;
+	for (i=1; i< argc; i++) {
+		printf("argument %d: %s\n",i,argv[i]);
+	}
+     printf("\nPID = %d - PPID = %d \n\n",getpid(), getppid());
+     return 0;
+}
diff --git a/2020-2021/S3T_TP_00_REVISIONS/processus_2.c b/2020-2021/S3T_TP_00_REVISIONS/processus_2.c
new file mode 100755
index 0000000..37e637b
--- /dev/null
+++ b/2020-2021/S3T_TP_00_REVISIONS/processus_2.c
@@ -0,0 +1,18 @@
+/*
+	gcc processus_2.c
+	Exemple : ./a.out PATH
+*/
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char* argv[]) 
+{
+  if (argc != 2)
+  { 
+	fprintf (stderr, "Syntaxe : %s <nom-de-variable>\n", argv[0]); 
+	exit (1); 
+  }
+  printf ("\n%s\n\n", getenv (argv[1]));
+  return EXIT_SUCCESS;
+}
+