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Merge 2 csv files with awk

I have 2 files pipe delimted and want to merge them based on a key e.g file 1 Code: 123$aaa$yyy$zzz 345$xab$yzy$zyz 456$sss$ttt$foo 799$aaa$ggg$dee file 2 Code: 123$hhh 345$ddd 456$xxx 888$zzz so if the key is the first field, and the result should be the common key between file 1 and 2 i.e. result will be  Full Article…