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https://unix.stackexchange.com/questions/291454/difference-between-sudo-user-and-root-user
https://askubuntu.com/questions/784186/whats-the-difference-between-login-as-user-and-changing-users-using-su-through
https://unix.stackexchange.com/questions/7013/why-do-we-use-su-and-not-just-su
https://www.tecmint.com/difference-between-su-and-su-commands-in-linux/
http://www.linfo.org/root.html
https://mediatemple.net/community/products/dv/204643810/how-do-i-disable-ssh-login-for-the-root-user
https://linuxconfig.org/how-to-login-as-root-user-on-ubuntu-xenial-xerus-16-04-linux-desktop
https://en.wikipedia.org/wiki/Su_(Unix)
https://kb.iweb.com/hc/en-us/articles/230241728-Using-the-su-command-and-switching-from-user-to-root
https://books.google.de/books?id=YHfuGXTd45kC&pg=PA175&lpg=PA175&dq=does+su+count+as+a+root+login
https://books.google.de/books?id=XU1Dg_szpqwC&pg=PA55&lpg=PA55&dq=does+su+count+as+a+root+login
https://ask.fedoraproject.org/en/question/119668/fedora-28how-to-set-up-root-password/