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I've taken the liberty to add some explaination to Franklin52's code:


awk -v nfiles="4" '
NR==FNR{a[$0]++;next} # NR is the current record number counting from start of programme
...

His script is taking advantage of the fact that if the action part of a pattern-action pair is missing, the action {print;} is assumed. Further, !p is the same as saying 'p == 0' in the pattern...