Simple bash CSV array issue

Question

I'm trying to do something fairly simple, and I'm just coming up short. Here is an example variable I'm trying to work with:

20,80,443,53

The variable is just a string of ports separated by commas. I need to get those into an array.

Answer 1

Set IFS to , and use the read command with a here-string

IFS=, read -r -a arr <<<"20,80,443,53"
printf "%s\n" "${arr[@]}"

20
80
443
53