sfink: You can handle a lot of data that way -- but just be
sure you don't hit the nasty cases, such as a file containing
a file containing *only* newlines is not a nasty case
and requires no indexing at all. If you can figure out
before you read it that the file contains only newlines,
you change your "figure out the seek offset" subroutine
so that to get to line 120000 it seeks to byte 120000.
It doesn't get any easier!
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