@miah Thank you for the fascinating thread, as I was taught "sudo su -" as a set incantation, and while I could read it and know it was...weird...I also just accepted it. I come from an era before sudo, when you'd just type "su" to get a root shell, and it was common to call it "superuser" and not "switch user". I wonder if "sudo su -" started as a poorly considered "workaround" to use "su" in it's older way once sudo became common.