Re: power button shutdown from welcome screen w/o dialogs

From	William Unruh <unruh@invalid.ca>
Newsgroups	comp.os.linux.setup
Subject	Re: power button shutdown from welcome screen w/o dialogs
Date	2016-03-17 19:20 +0000
Organization	A noiseless patient Spider
Message-ID	<ncf023$msj$3@dont-email.me> (permalink)
References	(3 earlier) <ncekem$hvv$1@news.albasani.net> <ncem38$eav$1@dont-email.me> <ncen84$hfh$2@dont-email.me> <ncenho$eav$5@dont-email.me> <nceo6s$o5h$1@dont-email.me>

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On 2016-03-17, Bobbie Sellers <bliss-sf4ever@dslextreme.com> wrote:
> On 03/17/2016 09:55 AM, Charles T. Smith wrote:
>> On Thu, 17 Mar 2016 16:50:12 +0000, William Unruh wrote:
>>
>>>> But it's all still X, thank goodness.
>>>
>>> But linux, or unix is not X. X is a layer way above the operating
>>> system. There are lots of programs running that are not part of an X
>>> "session". And there are lots of ways of running programs (including
>>> everything you run when you remotely log in via ssh) which are not parts
>>> of an X "session".
>>>
>>> The question the OP seems to have wanted an answer to was: Given a
>>> remote machine which I log into with ssh, how do I shut it down without
>>> sitting in front of it in an X "session". The answer is
>>> systemctl poweroff
>>> or on some systems, just
>>> poweroff
>>> It may be, depending on permissions, that you need to be root to do
>>> that, so
>>> su
>>> <root password>
>>> systemctl poweroff
>>> should do it.
>>
>>
>> You have just gotten to the essence of the point.  The question that the
>> OP had (me) was how can I turn off my computer by pushing the power
>> button on the front, and the point is, ever since Poettering got his
>> hands on Unix, you cannot do that without a session.
>>
>
>
> 	You must be a troll.  The power switch has been only for turning
> on the computer for many years.  It came in with Windows.  As it is 
> implemented in Linux I am sure it was copied from Unix as a proper
> shutdown procedure is required for serious computing.  You might have
> to bypass it at times but proper shutdown is very important to nearly
> everything.

There are two things. The power button for a long time acts like a power
button of the type you are talking about if held down for a long time
(10 sec or so). If it is simply pushed in briefly, a signal is set in
hardware and the operating system grabs that signal and does what it
wants with that signal. Under X, that signal is often used to bring up a
dialog in X asking what the user wants (shutdown, logout,....). 
It seems he is asking, why can that signal no also do something if you
do not have an X sesssion running. I suspect you could set it up to do a
controlled shutdown (eg run systemctl poweroff even in a console
session)

> 	Poettering and systemd had nothing to do with this.
> 	I switched to x86 in the early 2000s and Linux shortly thereafter but 
> it was a requirement of XP and of Mandriva 6.
>
> 	bliss
>
> 	bliss

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Thread

power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-16 20:16 +0000
  Re: power button shutdown from welcome screen w/o dialogs The Natural Philosopher <tnp@invalid.invalid> - 2016-03-17 11:41 +0000
    Re: power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 14:56 +0000
      Re: power button shutdown from welcome screen w/o dialogs The Natural Philosopher <tnp@invalid.invalid> - 2016-03-17 15:43 +0000
        UNIX sessions (was: power button shutdown from welcome screen w/o dialogs) Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2016-03-18 13:34 +0000
          Re: UNIX sessions The Natural Philosopher <tnp@invalid.invalid> - 2016-03-18 13:51 +0000
  Re: power button shutdown from welcome screen w/o dialogs Joe Beanfish <joebeanfish@nospam.duh> - 2016-03-17 14:11 +0000
    Re: power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 14:55 +0000
  Re: power button shutdown from welcome screen w/o dialogs Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2016-03-17 08:19 -0700
    Re: power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 15:51 +0000
      Re: power button shutdown from welcome screen w/o dialogs The Natural Philosopher <tnp@invalid.invalid> - 2016-03-17 16:02 +0000
        Re: power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:30 +0000
          Re: power button shutdown from welcome screen w/o dialogs William Unruh <unruh@invalid.ca> - 2016-03-17 16:50 +0000
            Re: power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:55 +0000
              Re: power button shutdown from welcome screen w/o dialogs Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2016-03-17 10:09 -0700
                Re: power button shutdown from welcome screen w/o dialogs William Unruh <unruh@invalid.ca> - 2016-03-17 19:20 +0000
              Re: power button shutdown from welcome screen w/o dialogs The Natural Philosopher <tnp@invalid.invalid> - 2016-03-18 12:24 +0000
                Re: power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-18 12:58 +0000
                Re: power button shutdown from welcome screen w/o dialogs The Natural Philosopher <tnp@invalid.invalid> - 2016-03-18 13:34 +0000
      Re: power button shutdown from welcome screen w/o dialogs William Unruh <unruh@invalid.ca> - 2016-03-17 16:02 +0000
        Re: power button shutdown from welcome screen w/o dialogs Richard Kettlewell <rjk@greenend.org.uk> - 2016-03-17 16:47 +0000
          Re: power button shutdown from welcome screen w/o dialogs William Unruh <unruh@invalid.ca> - 2016-03-17 19:15 +0000
            Re: power button shutdown from welcome screen w/o dialogs The Natural Philosopher <tnp@invalid.invalid> - 2016-03-18 12:28 +0000
        Re: power button shutdown from welcome screen w/o dialogs The Natural Philosopher <tnp@invalid.invalid> - 2016-03-18 12:21 +0000
    Re: power button shutdown from welcome screen w/o dialogs William Unruh <unruh@invalid.ca> - 2016-03-17 15:58 +0000
      Re: power button shutdown from welcome screen w/o dialogs Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2016-03-17 10:17 -0700
        Re: power button shutdown from welcome screen w/o dialogs "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 17:30 +0000
          Re: power button shutdown from welcome screen w/o dialogs Aragorn <thorongil@telenet.be.invalid> - 2016-03-17 19:14 +0100
          Re: power button shutdown from welcome screen w/o dialogs William Unruh <unruh@invalid.ca> - 2016-03-17 19:22 +0000
  Re: power button shutdown from welcome screen w/o dialogs Mark <mcm@sdf.lonestar.org> - 2016-03-17 19:01 +0000

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