[app][process] rename options.output_ to options.output_file

est/app/process.py

@@ -143,11 +143,12 @@ def main(argv):
     parser.add_argument(
         "-o",
         "--output",
-        dest="output_",
+        dest="output_file",
         default=None,
         help="Output file of the workflow. Require at most one "
         "instance of XASOutputOW",
     )
+
     options = parser.parse_args(argv[1:])
     input_information = InputInformation(
         spectra_url=get_url(options.input_spectra),