I'm imagining :-D that each file opened has a pointer or equivalent indicating which line we are at. Then if we make a match on the first line of fileA the "while ( $ts_B = <$FILEB> )" statement is not scanning from the beginning of FILEB but from where it previously left off when we are seeking a match for the second line of FILEA. Is this correct? This is obviously important for efficiency and speed as I don't want to be starting all over and scanning through the whole file for each timestamp.

In reply to Re^2: matching datetimestamps and concatenating data where timestamps match from multiple large datafiles by Cosmic37
in thread matching datetimestamps and concatenating data where timestamps match from multiple large datafiles by Cosmic37

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