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  • White Owl, thanks a lot for your help. This works perfectly. Thanks again. Commented Mar 21, 2023 at 13:46
  • Just let me add, in case anyone need this code, because I have a 008 day and this is an octal number, a slightly change needs to be made in the range_start: range_start=$(( ((10#$day-1)/3)*3+1 )). Commented Mar 21, 2023 at 15:04