Deleting lines from a big file

Greetings, I'm looking for a way to delete problematic lines from very large data files (too large for buffered access). row-to-delete: 25 condition: "00000027" big-file: open/direct/lines %VeryBigDataFile.DAT skip big-file (row-to-delete - 1) line-to-check: first big-file if (find line-to-check condition) <> none [remove line] <------------- Is there some way to do this??? ^^^^^^^ (I'm still creeping along at the beginning of the learning curve!) [vincenke--ohsu--edu]