diff --git a/main.py b/main.py
index 3420006..67e3331 100644
--- a/main.py
+++ b/main.py
@@ -2,12 +2,29 @@
 
 # SPDX-License-Identifier: Apache-2.0
 
+import logging
+import warnings
+
 from runparams import RunParams
 from spec_parser import Model
 
 if __name__ == "__main__":
     cfg = RunParams()
 
+    if cfg.opt_quiet:
+        logging.basicConfig(level=logging.ERROR)
+        warnings.filterwarnings("ignore", module="rdflib")
+    elif cfg.opt_debug:
+        logging.basicConfig(level=logging.DEBUG)
+        warnings.filterwarnings("default", module="rdflib")
+    elif cfg.opt_verbose:
+        logging.basicConfig(level=logging.INFO)
+        warnings.filterwarnings("module", module="rdflib")
+    else:
+        logging.basicConfig(level=logging.WARNING)
+        warnings.filterwarnings("once", module="rdflib")
+        warnings.filterwarnings("ignore", message=r".*Assertions on rdflib\.term\.BNode.*RDF\.first and RDF\.rest.*")
+
     m = Model(cfg.input_dir)
     if not cfg.opt_nooutput:
         m.gen_all(cfg.output_dir, cfg)