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Looking for an awk (or sed) one-liner to remove lines from the output if the first field is a duplicate.
An example for removing duplicate lines I’ve seen is:
awk 'a !~ $0; {a=$0}'
Tried using it for a basis with no luck (I thought changing the $0’s to $1’s would do the trick, but didn’t seem to work).
This is a standard (very simple) use for associative arrays.