https://root.cern/
https://root.cern/install/
https://root.cern/install/dependencies/
https://root.cern/install/all_releases/
https://root.cern/get_started/
https://root.cern/manual/

2022
https://betterprogramming.pub/how-to-use-root-c-interpreter-shell-to-write-c-code-ebfd52d2642d

sample
#!/usr/bin/env -S root -l -b -q
{
    cout << "hello root!" << endl;
}