ENH: handle wrong number of arguments in Tutorials

Examples/Tutorials/FilteringPipeline.cxx

@@ -41,6 +41,13 @@
 
 int main(int argc, char * argv[])
 {
+  if (argc != 3)
+    {
+    std::cerr << "Usage: "
+        << argv[0]
+        << " <input_filename> <output_filename>"
+        << std::endl;
+    }
 // Software Guide : EndCodeSnippet
 
   //  Software Guide : BeginLatex

Examples/Tutorials/Multispectral.cxx

@@ -50,6 +50,14 @@
 
 int main(int argc, char * argv[])
 {
+  if (argc != 4)
+    {
+    std::cerr << "Usage: "
+        << argv[0]
+        << " <input_filename> <output_extract> <output_shifted_scaled>"
+        << std::endl;
+    }
+
   // Software Guide : EndCodeSnippet
 
   //  Software Guide : BeginLatex

Examples/Tutorials/Pipeline.cxx

@@ -35,6 +35,13 @@
 
 int main(int argc, char * argv[])
 {
+  if (argc != 3)
+    {
+    std::cerr << "Usage: "
+        << argv[0]
+        << " <input_filename> <output_filename>"
+        << std::endl;
+    }
 // Software Guide : EndCodeSnippet
 
   //  Software Guide : BeginLatex

Examples/Tutorials/ScalingPipeline.cxx

@@ -42,6 +42,13 @@
 
 int main(int argc, char * argv[])
 {
+  if (argc != 3)
+    {
+    std::cerr << "Usage: "
+        << argv[0]
+        << " <input_filename> <output_filename>"
+        << std::endl;
+    }
 // Software Guide : EndCodeSnippet
 
   //  Software Guide : BeginLatex

Examples/Tutorials/SimpleViewer.cxx

@@ -39,7 +39,7 @@ int main(int argc, char * argv[])
 
   if (argc != 2)
     {
-    std::cerr << "Usage: " << argv[0] << " inputImageFile " << std::endl;
+    std::cerr << "Usage: " << argv[0] << " <inputImageFile>" << std::endl;
     return EXIT_FAILURE;
     }