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Old 12-08-2009, 08:06 PM   #1
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grub boot to "1" "S" or "single"

I have a silly (?) trivia question: what is the difference between appending "1" OR "S" or "single" to the end of the grub boot line?

I'm not sure single works, since i've pretty much only used 1 for a few years now, but i don't notice a difference between 1 and S, but vaguely recall that there was/should be/is some sort of difference.

Any ideas?
Old 12-08-2009, 09:34 PM   #2
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Do you mean appending a string "1", "S" or "single" to a line in a Grub boot configuration which reads as the string "boot"?

boot 1
boot single

According to GRUB documentation, the boot command takes no arguments. I'd be surprised to hear that grub didn't complain about this -- if I have understood you correctly -- but in that case, then, none of them should have any particular effect.

Are you referring to some argument to the kernel? ?

Last edited by jhwilliams; 12-08-2009 at 09:39 PM.
Old 12-09-2009, 12:35 AM   #3
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I was talking about effectively modifying the kernel line in the /boot/grub/grub.conf file at boot time by editing it from grub.
The process is described for example here:

The kernel documentation only cites S , but not single or 1 ... so that doesn't clear anything up


grub, mode, user

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