[SOLVED] Retain first occurence of a pattern, remove all others
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1. I wish to identify lines by finding the first occurence of the 2nd tsv integer for each row e.g. 8996242, 8996242, 8996242, 9028933, 9063387, etc.
2. I wish to remove entire lines where the value above is not unique e.g. end up with
Personally I tend to prefer something along the the awk solution - in the real world I find many (most ?) situations are better served by keeping the data in the order presented.
Personally I tend to prefer something along the the awk solution - in the real world I find many (most ?) situations are better served by keeping the data in the order presented.
Agreed. Note that the sample input file was already sorted on the second field. I assumed that the real-world input file would also be sorted, but did not explicitly say so. If already sorted, the sort solution would not reorder the lines.
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