If I am reading the question correctly, I would use a modified version of dpuu's parent post.

sort -u -t '|' infile1 infile2 | perl myprog.pl

And just have myprog.pl look for lines where the leading key is repeated two lines in a row. If the timestamp was the same in both files, there will be only one row (-u means make unique).

-jack

In reply to Re: Re: Large Set Efficiency Question by jackdied
in thread Large Set Efficiency Question by insensate

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