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https://en.wikipedia.org/wiki/Universally_unique_identifier
blkid provides UUID info in 5 fields: 8-4-4-4-12
# UUID 5 hexadecimal fields: 8-4-4-4-12
--> sudo blkid
/dev/sda1: UUID="01234567-0123-0123-0123-0123456789ab" TYPE="swap" PARTUUID="600f5607-01"
/dev/sda2: UUID="9dfb0ac4-3c93-4c88-9f0b-533ca7332efe" TYPE="ext4" PTTYPE="dos" PARTUUID="600f5607-2"
/dev/sda3: UUID="41369f78-d14c-4423-b8f8-ef4bf91a66ff" TYPE="ext4" PARTUUID="600f5607-03"
/dev/sdb1: UUID="d26018fa-6c45-4eff-b306-fef732f5f084" TYPE="ext4" PARTUUID="b30aafa3-eef5-4c79-ab5-704f18e4c2b8"
TO CREATE a Filesystem with a UUID
mkfs.ext4 -U 01234567-0123-0123-0123-0123456789ab /dev/sdb2
/etc/fstab:
01234567-0123-0123-0123-0123456789ab /files ext4 acl,user_xattr 1 1
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root@linuxbox [/boot/grub2]
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--> history
1 2016-12-07 09:10:27 cd /boot/grub2/
2 2016-12-07 09:10:28 ll
3 2016-12-07 09:10:33 grep UUID *
4 2016-12-07 09:10:40 more /etc/fstab
5 2016-12-07 09:10:53 grep UUID /etc/fstab
6 2016-12-07 09:27:32 fdisk -l
7 2016-12-07 09:27:56 history
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root@linuxbox [/boot/grub2]
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--> grep UUID *
grep: backgrounds: Is a directory
grep: fonts: Is a directory
grub.cfg: linux /boot/vmlinuz-4.1.31-30-default root=UUID=9ddb0ac4-3c93-4c88-9f0b-533ca7332efe resume=/dev/sda1 splash=silent quiet showopts
grub.cfg: linux /boot/vmlinuz-4.1.31-30-default root=UUID=9ddb0ac4-3c93-4c88-9f0b-533ca7332efe resume=/dev/sda1 splash=silent quiet showopts
grub.cfg: linux /boot/vmlinuz-4.1.27-27-default root=UUID=9ddb0ac4-3c93-4c88-9f0b-533ca7332efe resume=/dev/sda1 splash=silent quiet showopts
grep: i386-pc: Is a directory
grep: locale: Is a directory
grep: themes: Is a directory
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root@linuxbox [/boot/grub2]
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--> grep UUID /etc/fstab
UUID=901d5c24-225b-47a0-ae55-85520a6f8f61 swap swap defaults 0 0
UUID=9ddb0ac4-3c93-4c88-9f0b-533ca7332efe / ext4 acl,user_xattr 1 1
UUID=41369c78-d14c-4423-b8f8-ea4bf91a66ff /home ext4 acl,user_xattr 1 2
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root@linuxbox [/boot/grub2]
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--> fdisk -l
Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x600b5607
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 12064767 12062720 5.8G 82 Linux swap / Solaris
/dev/sda2 * 12064768 95956991 83892224 40G 83 Linux
/dev/sda3 95956992 976773119 880816128 420G 83 Linux
Disk /dev/sdb: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: C5E737A3-8865-4A88-B692-FA4D19E98724
Device Start End Sectors Size Type
/dev/sdb1 2048 976773134 976771087 465.8G Linux filesystem
a few links, search for more...
http://www.sudo-juice.com/how-to-change-the-uuid-of-a-linux-partition/
https://wiki.archlinux.org/index.php/Fstab#UUIDs
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