Usage: [args] gtfs_input_dir ... gtfs_output_dir

Args:
 --agencyId ID                    override the default agency id for imported GTFS data
 --transform=SPEC                 apply general transform from the specified definition
 --overwriteDuplicates            specify that duplicate GTFS entities should overwrite each other
 
Transforms:

You can specify transforms in a number of ways.  See the online documentation for more extensive documentation.