[Koha] problem in bulk import

Dear member, I am trying to bulk upload. But when i run the command always import only one record and same record. What is the actual command for bulk importing? screenshot root@vijay-home:/usr/share/koha-3.00.00/misc/migration_tools# ./bulkmarcimport.pl -n -300 -file /home/vijay/Desktop/records/* . 1 MARC records done in 0.0766611099243164 seconds what is the actual command for bulk importing. I have downloaded about 300 records from Library of congress Please suggest me, Thanks, vijay