fixes #5

nuke.cpp

@@ -9,12 +9,19 @@ for(int i=1;i<argc;i++){
 if (string(argv[i]) == "-v")
 {
 cout<<"patricus utils, version "+string(VERSION);
+return 0;
 }
     if(!filesystem::exists(argv[i]))
 {
 cerr<<"error, no such file or directory";
 return 1;
 }
+try
+{
 filesystem::remove_all(argv[i]);
 }
+catch(std::filesystem::filesystem_error){
+    cout<<"error: permission denied";
+}
+}
 }