[Bglug] Group Digest, Vol 3, Issue 6 - Thank you

Peter pjr at bmts.com
Wed Jun 10 19:37:40 EDT 2015


Thanks William. I guess that's why I try and do the cut and paste rather 
than re-type!
To reiterate:

Using the key combination Alt + SysRq, and while holding these keys
down, press these keys in sequence with a delay of several seconds
between each key press  r  e  i  s  u  b
Peter Richards


Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe. -  Albert Einstein

On 06/10/2015 12:00 PM, group-request at bglug.ca wrote:
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> Today's Topics:
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>     1. Something i learned today ... (Peter)
>     2. Talos Principle Solution (Peter)
>     3. Re: Something i learned today ... (Andrew Howlett)
>     4. Re: Something i learned today ... (William Park)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 09 Jun 2015 22:16:49 -0400
> From: Peter <pjr at bmts.com>
> To: group at bglug.ca
> Subject: [Bglug] Something i learned today ...
> Message-ID: <55779E11.3010607 at bmts.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> There is magic on the keyboard - incarnated in the SysRq (i think this
> stands for system request, long thought to be a holdover from the
> begining of time).
> You can use it, along with others to get messages to the kernel, if it
> hasn't panicked; for example when GoogleEarth locks up the X-Server and
> your screen transitions from the desert of Nevada to all black as just
> happened to me.
>
> Using the key combination Alt + SysRq, and while holding these keys
> down, press these keys in sequence with a delay of several seconds
> between each key press  r  e  i  s  b
>
>
>                "Cleanly Restarting Your System
>
>          Used in sequence, some of these actions can be used to cleanly
>          end processes, flush data to disk, unmount all file systems, and
>          restart your computer. To perform this process, press and hold
>          the Alt + SysRq key combination and ? while holding the Alt and
>          SysRq keys down ? type the following keys in order, pausing for
>          several seconds in between each key:
>
>              *reisub*
>
>          The mnemonic ?*R*aising *E*lephants *I*s *S*o *U*tterly
>          *B*oring? is often used to remember this sequence. Here?s what
>          each key does:
>
>            * *r* ? Puts the keyboard into raw mode, taking control of it
>              away from the X server.
>            * *e* ? Sends the terminate signal to all processes, asking
>              them to end gracefully.
>            * *i* ? Sends the kill signal to all processes, forcing them
>              to end immediately.
>            * *s* ? Flushes data from your cache to disk.
>            * *u* ? Remounts all file systems read-only.
>            * *b* ? Reboots your computer.
>
>          "
>
>
> Here is the link to the full document of Alt+SysRq's many charms and spells:
>
> https://www.kernel.org/doc/Documentation/sysrq.txt
>
> There's always something new to discover!
>
> Peter Richards
>




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