Need sample gawk to join two records with unique key $2.$1 has different entity eventhough $2 is key thats why there are ther are two different lines for same key I/p FIle not in sorted order 01|12345|AAAA 01|99|AAAA 01|888|AAAA 02|12345|BBBBB|CCCCC|DDDDD 02|99|BBBBB|CCCCC|DDDDD 02|888|BBBBB|CCCCC|DDDDD Output file: O/p file 01|12345|DDDDD 01|99|DDDDD 01|888||DDDDD
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