In most modern Linuxes, if you look in /etc/fstab you will see something like:

UUID=27fb9d06-8122-4a53-9930-97bd9fa57221 /usr ext4 defaults 1 1

This is not very helpful if you’re trying to figure out where your /usr directory is mounted… So how can you convert the UUID of a drive partition to the good old familiar /dev device […]