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I thought I did? :) NR is internal variable which holds the record number. So basically is the line number in this case. FNR is per-file, so if they're equal you're currently processing a line in...

Oh yes, sorry. I suppose I could have posted it while awaiting confirmation.


#!/usr/bin/awk -f
BEGIN { FS=OFS="," }
FNR==NR { a[$1]=$2; next }
($3 in a) { print $1, $2, a[$3], $4 }


Is...