To reprocess the log file each time seems a terrible waste of time and resources, not to mention storing your ever-growing index of lines you have already logged! Use seek() and tell(). You need only store a bookmark and you will know where to start from next time. This will need to be coordinated with whatever process truncates your log file, of course.

Dum Spiro Spero

In reply to Re: Trying to identify unique lines in a log file by GotToBTru
in thread Trying to identify unique lines in a log file by aditya1977

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