diff --git a/msh-console-library/command.cpp b/msh-console-library/command.cpp
index d877914..9331c86 100644
--- a/msh-console-library/command.cpp
+++ b/msh-console-library/command.cpp
@@ -92,6 +92,8 @@ namespace mshconsole {
         while (poptPeekArg(pc) != NULL)
             nonOptionArgs.push_back(const_cast<const char*>(poptGetArg(pc)));
 
+        poptFreeContext(pc);
+
         return (*funcCommand)(c,datas,nonOptionArgs);
     }
 
@@ -110,5 +112,10 @@ namespace mshconsole {
             }
         }
     }
+
+    Command::~Command(){
+
+    }
+
     const struct poptOption Command::POPT_TERMINATOR = {NULL,'\0',POPT_ARG_NONE,NULL,-1,NULL,NULL};
 }
diff --git a/msh-console-library/main.cpp b/msh-console-library/main.cpp
index 7457a17..d488dd1 100644
--- a/msh-console-library/main.cpp
+++ b/msh-console-library/main.cpp
@@ -55,17 +55,21 @@ int main(int argc, char **argv)
     string c = "msh-console-test";
     string ps = "[msh-console-test]:";
     Shell mshConsoleTest(c, ps, cin,cout,cerr, &setup);
-    Command* help = new Command("help", &helpExecute);
+    Command help("help", &helpExecute);
     struct poptOption h = {"help",'h',POPT_ARG_NONE,NULL,1000,"advance","advaced options"};
     struct poptOption p = {"prova",'p',POPT_ARG_STRING,NULL,1000,"cose","cosecose"};
-    help->addOption(h);
-    help->addOption(p);
+    help.addOption(h);
+    help.addOption(p);
+
+    Command exit("exit", &exitExecute);
+    Command cd("cd", &cdExecute);
 
     //add builtin commands
-    mshConsoleTest.addCmd(help);
-    mshConsoleTest.addCmd(new Command("exit", &exitExecute));
-    mshConsoleTest.addCmd(new Command("cd", &cdExecute));
+    mshConsoleTest.addCmd(&help);
+    mshConsoleTest.addCmd(&cd);
+    mshConsoleTest.addCmd(&exit);
     mshConsoleTest.launch();
+
     return EXIT_SUCCESS;
 }
 
diff --git a/msh-console-library/shell.cpp b/msh-console-library/shell.cpp
index 199a124..fab7742 100644
--- a/msh-console-library/shell.cpp
+++ b/msh-console-library/shell.cpp
@@ -60,11 +60,10 @@ namespace mshconsole {
 
         //Run the shell loop.
         int exitCode;
+        std::string* line=nullptr;
+        struct Params p;
 
         try{
-            std::string* line=nullptr;
-            struct Params p;
-
             while(1){
                 delete line;
                 outputStream << ps << " "; //Print the prompt.
@@ -91,8 +90,13 @@ namespace mshconsole {
 
                 //Execute the command.
                 executeCmd(p);
+
+                //Free p
+                deleteParams(p);
             };
         } catch(CommandExecutor::ExitException c) {
+            delete line;
+            deleteParams(p);
             exitCode=c.getCode();
         }
 
@@ -120,7 +124,9 @@ namespace mshconsole {
             catch (CommandNotFoundException){}
 
             //execute bash command or program
-            if((a=execvp(p.argv[0], p.argv)) == -1) {
+            a=execvp(p.argv[0], p.argv);
+
+            if(a == -1) {
                 outputStream << name << ": execution failed. Errno is set to: "<<strerror(errno)<<"\n";
                 std::exit(EXIT_FAILURE);
             }
@@ -181,9 +187,14 @@ namespace mshconsole {
     struct sigaction* setHandler(unsigned signal, void (*funcptr)(int, siginfo_t*, void*)){
         struct sigaction* before = new struct sigaction();
         struct sigaction sa;
+        sigset_t mask;
+        sigemptyset(&mask);
+        sigaddset(&mask, SIGTERM);
+        sa.sa_mask=mask;
         sa.sa_sigaction = funcptr;
-        sa.sa_flags = 0;
+        sa.sa_flags = SA_RESTART;
         sigaction(signal, &sa, before);
+        return before;
     }
 
     void restoreHandler(unsigned signal, struct sigaction* before){
@@ -212,6 +223,10 @@ namespace mshconsole {
         return p;
     }
 
+    void Shell::deleteParams(struct Params p){
+        freeString(p.argc,p.argv);
+    }
+
     bool Shell::SIGINTRaised = false;
 
     void Shell::addCmd(Command* cmd, bool isthread){
diff --git a/msh-console-library/shell.h b/msh-console-library/shell.h
index 85b272e..22d1f08 100644
--- a/msh-console-library/shell.h
+++ b/msh-console-library/shell.h
@@ -71,6 +71,7 @@ namespace mshconsole {
         static void SIGINTHandler(int,siginfo_t *info, void *);
         std::string* readLine();
         struct Params splitLine(const std::string* line);
+        void deleteParams(struct Params p);
 
         class IsUndoingLineException {};
         class CommandNotFoundException {};
diff --git a/msh-console-library/stringtoargcargv.cpp b/msh-console-library/stringtoargcargv.cpp
index 2e60931..a01ebed 100644
--- a/msh-console-library/stringtoargcargv.cpp
+++ b/msh-console-library/stringtoargcargv.cpp
@@ -37,7 +37,7 @@ namespace StringToArgcArgv{
     {
       std::vector<std::string> args = parse(str);
 
-      *argv = (char**)std::malloc((args.size()+1) * sizeof(char*));
+      *argv = new char*[args.size()+1]();
 
       int i=0;
       for(std::vector<std::string>::iterator it = args.begin();
@@ -45,7 +45,7 @@ namespace StringToArgcArgv{
           ++it, ++i)
       {
         std::string arg = *it;
-        (*argv)[i] = (char*)std::malloc((arg.length()+1) * sizeof(char));
+        (*argv)[i] = new char[arg.length()+1]();
         std::strcpy((*argv)[i], arg.c_str());
       }
       (*argv)[i]=NULL;
@@ -53,6 +53,13 @@ namespace StringToArgcArgv{
       *argc = args.size();
     }
 
+    void freeString(int& argc, char**& argv){
+        for(int i=0; i<argc; i++){
+            delete[] argv[i];
+        }
+        delete[] argv;
+    }
+
     std::vector<std::string> parse(const std::string& args)
     {
       std::stringstream ain(args);    // used to iterate over input string
diff --git a/msh-console-library/stringtoargcargv.h b/msh-console-library/stringtoargcargv.h
index 1c4d91b..75c565a 100644
--- a/msh-console-library/stringtoargcargv.h
+++ b/msh-console-library/stringtoargcargv.h
@@ -42,5 +42,6 @@ namespace StringToArgcArgv{
     bool _isWhitespace(char c);
     std::vector<std::string> parse(const std::string& args);
     void stringToArgcArgv(const std::string& str, int* argc, char*** argv);
+    void freeString(int& argc, char**& argv);
 }
 #endif //STRINGTOARGCARGV_H