From owner-freebsd-questions@FreeBSD.ORG  Mon Jun 18 18:32:38 2012
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	Mon, 18 Jun 2012 13:32:47 -0500 (CDT)
Date: Mon, 18 Jun 2012 13:32:47 -0500 (CDT)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
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To: mike@sentex.net, vladimir.budnev@gmail.com
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Cc: freebsd-questions@freebsd.org
Subject: Re: (Free 7.2) "su -l" didnt prompt password.Is it possbile?
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> From owner-freebsd-questions@freebsd.org  Mon Jun 18 09:25:32 2012
> Date: Mon, 18 Jun 2012 18:24:34 +0400
> From: Budnev Vladimir <vladimir.budnev@gmail.com>
> To: Mike Tancsa <mike@sentex.net>
> Cc: freebsd-questions@freebsd.org
> Subject: Re: (Free 7.2) "su -l" didnt prompt password.Is it possbile?
>
> 18.06.2012 18:02, Mike Tancsa написал:
> > On 6/18/2012 9:31 AM, Budnev Vladimir wrote:
> >> And It looked such way:
> >>
> >> %su -l
> > Before you enter this command, post the output of
> > id
> Unfortunately, we can not flashback or reproduce that step now, cause 
> we'v hurried and changed root password to avoid such strange "free 
> logins". And changing it back didnt change a thing. It was...and't went. 
> We had only buffered console output :(
> But mb you can point in what case there is possibility to make "su -l" 
> without any prompt.``o

This _will_ happen if one is root, does 'su' to another user. and then
another 'su' to root.