Thanks, just as I was writing in an array, I noticed your post. The only thing I am stumped on at this point is the sort. The sort should be on the unpacked epoch value. Something like: 
@index = sort unpacked @index;

sub unpacked {
    $a = unpack( 'V', substr( $a, 0, 4 ));
    $b = unpack( 'V', substr( $b, 0, 4 ));
    $a <=> $b;
};

[download]
The only problem, is that the data that's in @index after the sort is all messed up. It contains numbers that have nothing to do with the epoch or offset.

In reply to Re^2: Sort big text file - byte offset - 50% there (Added code) by msalerno
in thread Sort big text file - byte offset - 50% there by msalerno

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