06-15-2017
Thank you Rudi. I should learn awk, shouldn't I. That is a good way to count the occurrences. Is there a way, having counted the occurrences, to echo an entire line, if and only if the 1st 3rd 5th and 7th field of that line all appear at least 4 times in the file? (For the smaller sample data I posted, it would find an answer if we searched for lines whose entries all appear at least twice, instead of four times.)
You are correct not to worry about repeats within a single line, this is ruled out by construction of the data.
P.s. apologies if I overreacted--I think what was irritating was not that someone would want to make sure my question wasn't homework (I agree that a forum can quickly become useless to experts if it is overrun by homework questions), but instead the order to "please explain the company you work for and the nature of the problem you are working on", not only because it is intrusive, but because it suggests that only people who work for a company with a work-related problem can legitimately ask for scripting assistance here. But: your forum, your rules, ok.
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