how do I delete a file in SQl??? suddently confused

How do I delete the depart file, all lines together (if indeed there were many lines)? I do 'clear buffer' and yet I am able to open the depart file!

SQL> select * from dept;
DEPT LOC

1        DALLAS
2        CHICAGO

SQL>save depart
SQL>created file depart

Thanks,
Prabha Received on Wed Apr 12 2000 - 00:00:00 CDT