>> > sort -t, -k 5 | sed 's/,/ /g' | uniq -f4 -w13
> $ sort -t"," -k5,5 -u input_file
Hmmm, my manpage only listed -k=POS . Is -k=POS1[,POS2] a recent
addition ? Doesn't really matter, that machine got blown away last night
for a full upgrade anyway, so the new(er) version of sort will be
available
-k, --key=POS1[,POS2]
start a key at POS1, end it at POS 2 (origin 1)
New enough sort(1) that the old zero-based key specification does not
work at all. Version previous to that, it was deprecated. But even
then, there was $ sort +pos1 -pos2
to start at field pos1 and end at field pos2.
Yep, my new machine has this sort with start,end keys
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