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Correct your code, your double quote is mismatched also..
To compare files
nawk 'NR==FNR{a[$0];next;} !($0 in a){print "line:" FNR $0}' file1 file2

for duplicate try this
nawk...

!a[$0] or !a[$0] or !a[$0] --> if you use these result will be unexpected, and uses more memory as well, Hope you are reading answers yesterday I answered you on the same here

Nawk Problem - nawk...