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bug#19477: 24.4; Init script from su terminal

From: Álvar Ibeas
Subject: bug#19477: 24.4; Init script from su terminal
Date: Wed, 31 Dec 2014 20:34:13 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) 
Glenn Morris <rgm@gnu.org> writes:

> Emacs is behaving as documented.
>
> The `su' programs from coreutils (it's since been removed in favour of
> the util-linux one) and util-linux (as used by eg Red Hat) do not change
> LOGNAME or USER when su'ing to root.
>
> It seems that Debian's `su' comes from the `shadow' package and does
> change them.

Thanks for replying. I see now that most of the environment variables
are kept with the `-p' option.
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