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Yes, thanks for the description. And I've learned that the loop through the file the first time to build the array of counters is kept separate from the second loop that prints the line, via the...

Thank you Don. I corrected "cnt[$5]" to "c[5]" and it worked (on bash in OS X 10.6).

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Thanks Rudi. That...

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...

Thanks for the friendly welcome Don. I haven't had any homework assignments for over 25 years. I'm a hobbyist working on a maths problem. I wrote a little C program to generate this data, and want to...

I have a file where every line includes four expressions with a caret in the middle (plus some other "words" or fields, always separated by spaces). I would like to extract from this file, all those...