diff --git a/main/main.cpp b/main/main.cpp
index ff1ca5d..261829f 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -1,19 +1,34 @@
-#include "../src/SharedMemory.h"
-#include <unistd.h>
 #include <cstdlib>
-#include <iostream>
 #include <signal.h>
+#include "../src/SharedMemory.h"
+#include <sys/shm.h>
+#include <iostream>
 
 
 int main(int argc, char** argv)
 {
-    sharedMemoryInit();
+    initSharedMemory();
     struct sigaction sigIntHandler;
     sigIntHandler.sa_handler = deleteSharedMemory;
     sigemptyset(&sigIntHandler.sa_mask);
     sigIntHandler.sa_flags = 0;
     sigaction(SIGINT, &sigIntHandler, NULL);
-    sleep(3); // TODO: warte auf eingabe
+
     std::atexit(deleteSharedMemory);
+    std::string eingabe = "";
+    while(eingabe != "exit") {
+        std::cout << "cmd#  ";
+        std::cin >>  eingabe;
+       //if verschieden information ausgaben
+       if(eingabe == "info")
+       {
+           std::cout << "OUTPUT ------------------------ OUTPUT" << std::endl;
+           std::cout << "memory ID: " << shmget(impl.sharedMemoryKey, 0, 0) << std::endl;
+           std::cout << "Max memory Size: " << Max_Memory_Size << std::endl;
+           std::cout << "OUTPUT ------------------------ OUTPUT" << std::endl;
+           //Memory that is used now
+           //outprint of all memory
+       }
+    }
     return 0;
 }
\ No newline at end of file
diff --git a/src/SharedMemory.cpp b/src/SharedMemory.cpp
index 0e36071..3f7c3cc 100644
--- a/src/SharedMemory.cpp
+++ b/src/SharedMemory.cpp
@@ -1,44 +1,80 @@
 #include <cstdlib>
-#include <sys/ipc.h>
-#include <sys/shm.h>
 #include "SharedMemory.h"
 #include <iostream>
-#define Max_Memory_Size 8000
 
-int memoryAccessKey = 12345;
-int memID;
+key_t changedKey()
+{
+    int newKey;
+    std::cout << "Type in a new Key for the Shared Memory Segment" << std::endl;
+    std::cout << "new Key#";
+    std::cin >> newKey;
+    std::cout <<"New Key is -> " << newKey << std::endl;
+    return key_t(newKey);
+}
 
-void sharedMemoryInit() {
-    if ((memID = shmget(memoryAccessKey, Max_Memory_Size, IPC_CREAT | IPC_EXCL | 0666)) < 0) {
-        std::cerr << "Shared memory with Key: " << memoryAccessKey
-                  << " already exists. Delete by Hand before starting vKFM" << std::endl;
-        exit(0);
+std::string getAnswerFromUser()
+{
+    std::cout <<"answer# ";
+    std::string answer;
+    std::cin >> answer;
+    if(answer.compare("y") == 0 || answer.compare("n") == 0|| answer.compare("override") == 0) {
+        return answer;
     } else {
-        std::cout << "Shared memory with Key: " << memoryAccessKey << " allocated" << std::endl;
+        std::cout << "wrong input: pls answer with (y) for yes, (n) for no, or (override)\n";
+        getAnswerFromUser();
     }
 }
 
 
+void initSharedMemory(void) {
+    if(impl.sharedMemoryKey != key_t(0)) {
+        if (shmget(impl.sharedMemoryKey, Max_Memory_Size, IPC_CREAT | IPC_EXCL | 0666) < 0)
+        {
+            std::cout << "Shared Memory with Key: " << impl.sharedMemoryKey << " is already in use\n"
+            <<"You can change the Key( type -> y or n ), or you can override the shared memory Segment(type -> override)\n";
+            std::string answer = getAnswerFromUser();
+            if(answer.compare("y") == 0)
+            {
+                std::cout << "Please type in a new Key:\n";
+                std::cout << "#";
+                std::cin >> impl.sharedMemoryKey;
+                std::cout << "new Try with Key:c " << impl.sharedMemoryKey << std::endl;
+                initSharedMemory();
+            } else if(answer.compare("n") == 0) {
+                std::cout << "This will end shared memory" <<std::endl;
+                exit(0);
+            } else if(answer.compare("override") == 0) {
+                deleteSharedMemory();
+                initSharedMemory();
+            }
+        } else {
+            std::cout << "Shared Memory ist (Re-) allocated with Key: " << impl.sharedMemoryKey << std::endl;
+        }
+    } else {
+        std::cerr <<"key -> " << impl.sharedMemoryKey << " is not allowed here " << std::endl;
+        impl.sharedMemoryKey = changedKey();
+        initSharedMemory();
+    }
+}
+
 void deleteSharedMemory(int s)
 {
-    if (shmctl(memID, IPC_RMID, NULL) < 0 )
+    std::cerr << "programm ended with Code: " << s << std::endl;
+    if (shmctl(shmget(impl.sharedMemoryKey, 0, 0), IPC_RMID, 0) < 0 )
     {
-        std::cerr << "Failed to remove shared Memory, maybe not existing: try cmd: ipcs " << std::endl;
+        std::cerr << "Failed to remove shared Memory, maybe not existing: try cmd: ipcs, then delete with ipcrm -m $memID " << std::endl;
     } else {
         std::cout << "shared Memory deleted" << std::endl;
     }
-    exit(0);
 }
 
 void deleteSharedMemory(void)
 {
-    if (shmctl(memID, IPC_RMID, NULL) < 0 )
+    if (shmctl(shmget(impl.sharedMemoryKey, 0, 0), IPC_RMID, 0) < 0 )
     {
         std::cerr << "Failed to remove shared Memory, maybe not existing: try cmd: ipcs " << std::endl;
     } else {
         std::cout << "shared Memory deleted" << std::endl;
     }
-    exit(0);
 }
 
-
diff --git a/src/SharedMemory.h b/src/SharedMemory.h
index a4f0406..96aefca 100644
--- a/src/SharedMemory.h
+++ b/src/SharedMemory.h
@@ -1,13 +1,15 @@
 #ifndef SHARED_MEMORY_H
 #define SHARED_MEMORY_H
+#include <sys/shm.h>
+#include <iostream>
+#include "internal.h"
 
 //ID-Speicherbereich
 //Größe des Speicherbereichs hier 8MB (8000)
 #define shmMaxSize 8000
-
 //Shared-Memory-Segment erstellen oder öffnen – shmget()
-void sharedMemoryInit();
+#define Max_Memory_Size 8000
 void deleteSharedMemory(int s);
 void deleteSharedMemory(void);
-
+void initSharedMemory(void);
 #endif //SHARED_MEMORY_H
diff --git a/test/test_demo.cpp b/test/test_demo.cpp
index 4021d86..fde1445 100644
--- a/test/test_demo.cpp
+++ b/test/test_demo.cpp
@@ -2,6 +2,6 @@
 #include "../src/SharedMemory.h"
 
 TEST_CASE("Demo test") {
-   // REQUIRE(test() == 42);
+   //REQUIRE(test() == 42);
 }