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    What have you tried so far? Commented May 4, 2021 at 18:56
  • 2
    Skip every three or just extract unique values? Commented May 4, 2021 at 19:02
  • Skip every three. The above is just an example but I will apply it to my own data. Commented May 4, 2021 at 19:10
  • 1
    Of the 4 lines with a in your example, which one do you want (the first, the fourth) or are they identical? Are you perhaps looking for the uniq command? Commented May 4, 2021 at 19:17