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  • If not a duplicate, heavily related to unix.stackexchange.com/questions/596343/… Commented Jul 3, 2020 at 11:30
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    for Q1 : you can fork new shell for all 3 sites, but you'll be forking array as well and won't be able to merge them. why not use temporary files site$i_down.txt and site$i_up.txt Commented Jul 3, 2020 at 11:35
  • This sounds like a case for variable indirection (see this answer), although I am not sure if it works for non-scalar variables, too ... Commented Jul 3, 2020 at 12:00