SQL & PL/SQL

I would like to know if I'd get an ORA error if the OS asks for confirmation when I try to delete a file.

This is the situation: the OS is AIX, the directory I am using is writeable for world, but the files are not mine. So on in AIX when I try "rm filename" it asks me for confirmation.
When I use utl_file.fremove to do the same thing I get an ORA-29283: invalid file operation . Changing the file permissions to a+w helps because then I can use utl_file.fremove, but I'd rather have an equivalent of "-f" for the utl_file package.

Does it exist?
Thanks
Wendy