diff --git a/ActiveCommand.cpp b/ActiveCommand.cpp
index b155d35..18038ae 100644
--- a/ActiveCommand.cpp
+++ b/ActiveCommand.cpp
@@ -17,7 +17,7 @@ namespace commands
         Manager* mgr = Manager::get_instance();
         int user_id;
         args >> user_id;
-        if (!user_id)
+        if (!args)
             throw Error(102, "Ein Parameter eines Befehls konnte nicht gelesen werden");
         const User* u = mgr->get_user(user_id);
         if (!u)
diff --git a/ListCommand.cpp b/ListCommand.cpp
index 30dec71..4a08f2b 100644
--- a/ListCommand.cpp
+++ b/ListCommand.cpp
@@ -29,6 +29,6 @@ namespace commands
             for (const Assignment* a : mgr->get_assignments())
                 cout << *a;
         else
-            throw Error(101, "Befehl ist unbekannt.");
+            throw Error(102, "Ein Parameter eines Befehls konnte nicht gelesen werden");
     }
 } // commands
diff --git a/Manager.cpp b/Manager.cpp
index be1c422..961db75 100644
--- a/Manager.cpp
+++ b/Manager.cpp
@@ -236,7 +236,7 @@ namespace util
         if (this->users.count(id) == 0)
             throw Error(401, "Eine solche BenutzerIn existiert nicht.");
         //Assigment
-        if (this->get_assignments_for_user(id).empty()) {
+        if (!this->get_assignments_for_user(id).empty()) {
             throw Error(201, "Benutzer kann nicht gelöscht werden.");
         }
         this->users.erase(id);
@@ -246,7 +246,7 @@ namespace util
     {
         if (this->tasks.count(id) == 0)
             throw Error(402, "Eine solche Aufgabe existiert nicht.");
-        if (this->get_assignments_for_task(id).empty()) {
+        if (!this->get_assignments_for_task(id).empty()) {
             throw Error(201, "Aufgabe kann nicht gelöscht werden.");
         }
         this->tasks.erase(id);
diff --git a/ShowCommand.cpp b/ShowCommand.cpp
index 05c44ac..90424c0 100644
--- a/ShowCommand.cpp
+++ b/ShowCommand.cpp
@@ -1,36 +1,43 @@
 #include "ShowCommand.h"
 
 #include "Error.h"
-#include "Util.h"
 #include "Manager.h"
+#include "Util.h"
 
+using err::Error;
+using models::AddTask;
+using models::AddUser;
 using util::Manager;
 using util::Util;
-using models::AddUser;
-using models::AddTask;
-using err::Error;
 
-namespace commands
-{
-    ShowCommand::ShowCommand() : SubCommand("show", false)
-    {
-    }
+namespace commands {
+    ShowCommand::ShowCommand() : SubCommand("show", false) {}
 
-    void ShowCommand::run(stringstream& args)
-    {
-        Manager* mgr = Manager::get_instance();
+    void ShowCommand::run(stringstream &args) {
+        Manager *mgr = Manager::get_instance();
         const string data_type = Util::read_string(args);
-        if (data_type == "user")
-            for (User* u : mgr->get_users()) {
-                AddUser au = {*u};
-                cout << au;
+        int show_id;
+        args >> show_id;
+        if (!args)
+            throw Error(102, "Ein Parameter eines Befehls konnte nicht gelesen werden");
+        if (data_type == "user") {
+            User *user = mgr->get_user(show_id);
+            if (user == nullptr) {
+                throw Error(401, "Eine solche BenutzerIn existiert nicht.");
             }
-        else if (data_type == "task")
-            for (Task* t : mgr->get_tasks()) {
-                AddTask at = {*t};
-                cout << at;
+            AddUser unid_user = {*user};
+            cout << unid_user;
+
+        }
+
+        else if (data_type == "task") {
+            Task *task = mgr->get_task(show_id);
+            if (task == nullptr) {
+                throw Error(401, "Eine solche BenutzerIn existiert nicht.");
             }
-        else
+            AddTask unid_task = {*task};
+            cout << unid_task;
+        } else
             throw Error(102, "Ein Parameter eines Befehls konnte nicht gelesen werden");
     }
-} // commands
+} // namespace commands
diff --git a/User.cpp b/User.cpp
index 15ab721..dac1c4b 100644
--- a/User.cpp
+++ b/User.cpp
@@ -56,7 +56,7 @@ namespace models {
     }
 
     ostream& operator<<(ostream& os, const AddUser& u) {
-        os << u.get_name() << " " << u.get_surname();
+        os << u.get_name() << " " << u.get_surname() << "\n";
         return os;
     }
 
diff --git a/main.cpp b/main.cpp
index 4014c5c..abb15f4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,14 +1,15 @@
 #pragma once
 #include "ActiveCommand.h"
-#include "std_lib_inc.h"
-#include "parameter_reader.h"
-#include "HelpCommand.h"
 #include "AddCommand.h"
 #include "AssignCommand.h"
 #include "DelCommand.h"
 #include "Error.h"
+#include "HelpCommand.h"
 #include "ListCommand.h"
+#include "ShowCommand.h"
 #include "UnassignCommand.h"
+#include "parameter_reader.h"
+#include "std_lib_inc.h"
 
 using commands::SubCommand;
 using commands::HelpCommand;
@@ -18,6 +19,7 @@ using commands::DelCommand;
 using commands::AssignCommand;
 using commands::UnassignCommand;
 using commands::ActiveCommand;
+using commands::ShowCommand;
 using err::Error;
 
 const vector<SubCommand*> handlers = {
@@ -28,6 +30,7 @@ const vector<SubCommand*> handlers = {
     new AssignCommand(),
     new UnassignCommand(),
     new ActiveCommand(),
+    new ShowCommand(),
 };
 
 int main(int argc, char** argv)