diff --git a/pash_annotations/annotation_generation/annotation_generators/InputOutputInfoGeneratorCustom.py b/pash_annotations/annotation_generation/annotation_generators/InputOutputInfoGeneratorCustom.py
new file mode 100644
index 0000000..16f8034
--- /dev/null
+++ b/pash_annotations/annotation_generation/annotation_generators/InputOutputInfoGeneratorCustom.py
@@ -0,0 +1,22 @@
+from pash_annotations.annotation_generation.annotation_generators.InputOutputInfoGenerator_Interface import InputOutputInfoGeneratorInterface
+from pash_annotations.datatypes.BasicDatatypes import Operand
+
+
+class InputOutputInfoGeneratorGrep(InputOutputInfoGeneratorInterface):
+
+    def generate_info(self) -> None:
+        #no flags case
+        self.set_implicit_use_of_stdout()
+        """
+        if self.does_flag_option_list_contain_at_least_one_of(["-e", "-f"]):
+            if self.get_operand_list_length() == 0:
+                self.set_implicit_use_of_stdin()
+            else:
+                self.all_operands_are_streaming_inputs() # this is true also if empty
+        """
+        #else:
+        self.set_first_operand_as_config_arg_type_string()
+        if self.get_operand_list_length() == 1:
+            self.set_implicit_use_of_stdin()
+        else:
+            self.all_but_first_operand_is_streaming_input()