[Koha] problem in bulk import

[vijay kumar]

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 at 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