[Bglug] Something i learned today ...

Andrew Howlett andrew at howlett.net
Wed Jun 10 00:14:49 EDT 2015


cool. thanks peter

On 9 Jun 2015, at 10:16 PM, Peter <pjr at bmts.com> wrote:

> 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 “Raising Elephants Is So Utterly Boring” 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
> -- 
> Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe. -  Albert Einstein
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