Thank you Ken. I limited the search terms to 500 and that program you wrote, while it works flawlessly, has been running over an hour and still going. I don't know when it will end.

Interestingly enough this command processes all search terms and the complete file in 3 minutes 24 seconds.

time grep -P 'Z' file_to_search | awk '{print $1}' | sort | uniq --count > uniq.count

In reply to Re^2: Nested greps w/ Perl by wackattack
in thread Nested greps w/ Perl by wackattack

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