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scripting - Intersection of two arrays in BASH - Unix & Linux Stack Exchange
[https://unix.stackexchange.com/questions/104837/intersection-of-two-arrays-in-bash] - - public:mzimmerm
The only one describing array manipulations as sets!
Set operations in bash
[https://catonmat.net/ftp/setops.txt] - - public:mzimmerm
NOT using arrays, assume set are files. But one can always convert files to arrays and vice versa.