diff -r aebaf590a838 -r f66c759d1111 src/relpipe-tr-grep.cpp
--- a/src/relpipe-tr-grep.cpp	Mon Dec 10 15:19:14 2018 +0100
+++ b/src/relpipe-tr-grep.cpp	Mon Dec 10 21:17:26 2018 +0100
@@ -42,22 +42,22 @@
 	setlocale(LC_ALL, "");
 	CLI::untieStdIO();
 	CLI cli(argc, argv);
-	
+
 	int resultCode = CLI::EXIT_CODE_UNEXPECTED_ERROR;
 
 	try {
 		std::shared_ptr<RelationalReader> reader(Factory::create(std::cin));
-		GrepHandler handler(std::cout);
+		GrepHandler handler(std::cout, cli.arguments());
 		reader->addHandler(&handler);
 		reader->process();
 
 		resultCode = CLI::EXIT_CODE_SUCCESS;
 
-	} catch (RelpipeCLIException e) {
+	} catch (RelpipeCLIException& e) {
 		fwprintf(stderr, L"Caught CLI exception: %ls\n", e.getMessge().c_str());
 		fwprintf(stderr, L"Debug: Input stream: eof=%ls, lastRead=%d\n", (cin.eof() ? L"true" : L"false"), cin.gcount());
 		resultCode = e.getExitCode();
-	} catch (RelpipeReaderException e) {
+	} catch (RelpipeReaderException& e) {
 		fwprintf(stderr, L"Caught Reader exception: %ls\n", e.getMessge().c_str());
 		fwprintf(stderr, L"Debug: Input stream: eof=%ls, lastRead=%d\n", (cin.eof() ? L"true" : L"false"), cin.gcount());
 		resultCode = CLI::EXIT_CODE_DATA_ERROR;