I’ve got a csv file where the left most column contains an ID field. Is there a clever way I can use any utility programs such as sed to find any ID’s that are used more than once?
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I’ve got a csv file where the left most column contains an ID field. Is there a clever way I can use any utility programs such as sed to find any ID’s that are used more than once?
If all you want is the IDs, then you can try
where
$NUMis the number of the field containing the ID. Thecutcommand will extract a list of ids, and theuniqcommand will show you only those which are duplicated.