There is an update to this post available: UUIDs and Linux: Everything you ever need to know.
The Universally Unique Identifier can be used to identify a device independent form its mount point or device name. This is more and more important as many devices today support hot-plugging or are external anyway. Therefore it makes sometimes sense to access a device (for example in
fstab) not by device name but by the UUID.
There are several ways to get the UUID. The first one uses the
/dev/directory. While you are on is you might want to check other
by-*directories, I never knew of them.12
$ ls -l /dev/disk/by-uuid
lrwxrwxrwx 1 root root 10 11. Okt 18:02 53cdad3b-4b01-4a6c-a099-be1cdf1acf6d -> ../../sda2
Another way to get the uuid by usage of the tool
$ blkid /dev/sda1
There you also get the label and other information. Quite usefule.
Btw., if you wonder how “unique” this unique is, here a quote from Wikipedia:
1 trillion UUIDs would have to be created every nanosecond for 10 billion years to exhaust the number of UUIDs.
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