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From: Kai Grossjohann <kai.grossjohann@gmail.com>
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Subject: Re: What does the minus sign - do?... in the command sudo su -
Date: Mon, 30 Sep 2013 13:04:16 -0700 (PDT)
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On Wednesday, September 25, 2013 11:19:32 AM UTC+2, Don Saklad wrote:
> What does the minus sign - do?... in the command
> 
>      sudo su -

May I propose to use "sudo -i" instead?  It starts a login shell.

"sudo su -" is similar: sudo starts su which starts a login shell.  I think it makes more sense to have sudo start a login shell, than to have sudo start su which starts a login shell...