How do you get a UUID from a a device on the grub2 prompt?

Question

I'm trying to perform some grub2 troubleshooting related to this question, and as part of the troubleshooting I'm trying to figure out what grub can see during the boot. How can I get the UUID of, say (hd0,msdos1) while I'm at the grub2 prompt?

score 30 · Accepted Answer · answered Dec 11 '12 at 20:02

30

The ls -l command should be revealing.

answered Dec 11 '12 at 20:02

psusi

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For those wondering why [`ls -l` would do this](https://i.stack.imgur.com/ITURg.png), it's because the GRUB prompt supports [an `ls` command that can list devices](https://www.gnu.org/software/grub/manual/html_node/ls.html). – Eliah Kagan Jan 22 '17 at 05:17

score 3 · Answer 2 · answered Aug 23 '19 at 17:07

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Programmatically, this can be queried with the probe command, e.g.:

probe --fs-uuid (hd0,gpt6)

The result can also be assigned to a variable with --set:

probe --set devuuid --fs-uuid (hd0,gpt6)
echo $devuuid

answered Aug 23 '19 at 17:07

Remember Monica

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score 1 · Answer 3 · answered Aug 07 '19 at 11:10

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From GRUB command line, cat (hd0,gpt9)/boot/grub/grub.cfg should reveal the UUID. Remember to use "set pager=1" to scroll page by page

answered Aug 07 '19 at 11:10

emeralddove

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How do you get a UUID from a a device on the grub2 prompt?

3 Answers3

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