Re: [SOLUTION] Re: Bullseye: setting and using $DISPLAY after su -
On Wed 06 Jan 2021 at 07:35:08 (-0500), Greg Wooledge wrote:
> On Tue, Jan 05, 2021 at 10:38:39PM -0600, David Wright wrote:
> > But here on debian-user, I was really more interested in why the value
> > of DISPLAY was apparently changed by one su and not the other (or
> > perhaps by both). The explanation, "probably with an alias for su",
> > alias su="su -w DISPLAY", doesn't make any sense to me. Explanations?
>
> "su" will leave the DISPLAY variable intact, and "su -" will remove it.
> I can see no evidence to the contrary, regardless of whether I'm using
> the ALWAYS_SET_PATH config variable.
>
> The behavior is simple and consistent for me.
And for me. The only difference from the output you posted is
$ cat /etc/default/su
cat: /etc/default/su: No such file or directory
$
but that only affects PATH anyway.
> If someone is seeing DIFFERENT behavior than this, they have yet to
> demonstrate it for us.
I thought the OP already had demonstrated it, in
https://lists.debian.org/debian-user/2021/01/msg00000.html
where we have:
User's DISPLAY not revealed
After su DISPLAY=:0.0
(exit)
User's DISPLAY not revealed
After su - DISPLAY=:0
As I pointed out, these values will both succeed in pointing to the
same actual display (though I only tested that they both work on my
own display, called ":0"). But they are textually "DIFFERENT", so
they can't both be copied from the user's (unrevealed) value.
So what I sought was an explanation of the OP's transcript, not
that of yours and mine.
Cheers,
David.
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