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    ... and it could be done in other ways, e.g. perl. Generally forget sed for arithmetics. Commented Sep 28, 2020 at 9:08
  • Thank you for this! I would need to append this data as a new column in an output CSV file, how could I do that in the command line format I mentioned after the $ sign? Commented Sep 28, 2020 at 13:32
  • @Phillip: for output redirection, just do ` > output-file` at the end f the one liner above. See edit. Commented Sep 28, 2020 at 13:51
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    @Cbhihe You can actually incorporate calculation of the "current year" into the awk call via the strftime() function: awk 'BEGIN{year=strftime("%Y"); FS="/"} ..... '. Commented Sep 28, 2020 at 15:21
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    I can't let the sed arithmetic comment go without mentioning unix.stackexchange.com/a/36959/117549 Commented Oct 2, 2020 at 0:26