How do you stop inserting records after 50 records are inserted from flat file through sql*loader

This can be done using option LOAD

OPTIONS (SKIP=1, LOAD=10, ERRORS=5)
LOAD DATA infile c:/sv_test.dat
REPLACE INTO TABLE sv_test_sql_tbl
FIELDS TERMINATED BY "," optionally enclosed by '"'
trailing nullcols
(
    item_number     "trim(:item_number)"
  , vendor_name "trim(:vendor_name)"
  , vendor_site_name "trim(:vendor_site_name)"
  , supplier_item   "trim(:supplier_item)"
  , process_flag  Constant 'UNPROCESSED'
)

In the example above the total records to be loaded is limited to 10, error records is 5 and 1 record is skipped.

These options can also be given with sqlldr command as follows..

sqlldr control='sv_test.ctl' data='sv_test.dat' load=10 errors=5  skip=1