Unique lines based on the first field sort, CLI In the extract below of three lines that have the same first field ( ), I would like to keep line 2 because it has additional tags (sort, CLI) and delete lines #1 and #3: unique-lines-based-on-the-first-field Is there a way to just let me know so I can choose which to retain? I know about sort -k1,1 -u but that will automatically (non-interactively) remove all but the first hit. I want to identify but not remove entries that have the first field (reference url) identical. Same for third field which may or may not be present. The first column is the reference's url the second column is the title which may vary a bit depending on how the entry was made. I have my references as a text file with a long list of entries and each has two (or more) fields.
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