04-17-2018
Traditionally there was a difference between SysV su and BSD su, only the latter sets USER (and LOGNAME does not exist).
Portable is only su - that is a kind of login shell that sets LOGNAME (if exists) and USER.
GNU/Linux started more BSD-compatible, but later partly changed to Posix that is more similar to SysV.
So yes, it is a mess, and sudo, being a kind of su, makes it even worse.
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