diff --git a/src/rougail/user-data-environment/data.py b/src/rougail/user-data-environment/data.py
index 9c3e16f..53dc163 100644
--- a/src/rougail/user-data-environment/data.py
+++ b/src/rougail/user-data-environment/data.py
@@ -50,17 +50,18 @@ class RougailUserDataEnvironment:
         else:
             self.errors = []
             self.warnings = []
+        # bash environment variables (key/value pairs)
+        self.rougail_environment_vars = get_rougail_environment()
 
     def run(self):
         self.config.property.read_write()
         self.parse(self.config)
         self.config.property.read_only()
-        # about unused ROUGAIL_ environment variables
-        # FIXME
-#        if len(self.rougail_environment_vars):
-#            unused_env_var_str = " ".join(self.rougail_environment_vars.keys())
-#            self.warnings.append("the following rougail environment variables "
-#                                 "are not used : " + unused_env_var_str)
+        # about unused bash environment variables
+        if len(self.rougail_environment_vars):
+            unused_env_var_str = ", ".join(self.rougail_environment_vars.keys())
+            self.warnings.append("the following rougail bash environment "
+                                 "variable(s) are not used : " + unused_env_var_str)
 
     def parse(self, config):
         for option in config:
@@ -78,9 +79,8 @@ class RougailUserDataEnvironment:
         option_name = option.path()
         # the bash variable are in upper case
         option_name = option_name.upper()
-        rougail_environment_vars = get_rougail_environment()
         # if the option is not in the bash environment, do nothing
-        if option_name not in rougail_environment_vars.keys():
+        if option_name not in self.rougail_environment_vars.keys():
             return
         # actually the rougail type **is not** the same thing as
         # the tiramisu type, which is in `option.type`
@@ -90,11 +90,7 @@ class RougailUserDataEnvironment:
         # carefull, the coercion function 'func' could be None
         # -> in this case, do nothing
         type_obj = CONVERT_OPTION.get(option_type, {}).get("func")
-        option_bash_value = rougail_environment_vars.pop(option_name)
-        print("--------------")
-        print(option_name)
-        print(option_bash_value)
-        print(rougail_environment_vars)
+        option_bash_value = self.rougail_environment_vars.pop(option_name)
         if ismulti:
             # here we expect the bash option value of a multi to be coma separated:
             option_bash_value = [opt.strip() for opt in option_bash_value.split(",")]