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Re: How to exit from linux kernel and return to then grub?
From: |
Lennart Sorensen |
Subject: |
Re: How to exit from linux kernel and return to then grub? |
Date: |
Sun, 18 May 2014 10:43:12 -0400 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Sun, May 18, 2014 at 01:33:15PM +0800, Z C wrote:
> If I boot into a linux kernel using a grub command like "linux /vmlinuz;
> inirtd /initrd; boot", how do I shutdown linux itself (but do not power off
> or reboot the computer hardware) and return back to the grub directly?
>
> What I meant is something equivalent to the "exit" command in most shells:
> If you are within one shell and you enter another shell, then if you want
> to quit the second shell and return back to the first shell, just simply
> type exit. All env variables and commands you previous typed in the first
> shell are completely intact.
>
> Suppose I am now in the grub shell, and then I boot into a tiny linux
> kernel, say, a busybox shell, then what can I do to exit the second shell
> (i.e. busybox shell) and return to the first shell (i.e. grub shell)? Of
> course I can enter the grub shell again by simply rebooting the hardware,
> but this is not what I want.
Once linux boots, it does not preserve the boot loader in memory (whyever
would it do that?)
If you want to invent a way to load grub using kexec so you can switch
back to grub fropm a running linux system, well have fun, but why bother?
Where is the use? It is so hard to deal with what the state of all the
hardware is without doing a reset.
--
Len Sorensen