UUID-unique identifier of a device in linux-Linux Enterprise Application-Linux server application information. For more information, see the following section. In linux, everything is a file. All hardware devices are also considered as files by the system, and these hardware device files are stored in the/dev directory. However, such device files sometimes cannot uniquely identify a hardware, the most typical example is mobile devices, such as USB flash drives. When a USB flash drive is connected to the system, the device name/dev/sda1 may be assigned to it, however, if the USB flash drive is inserted into another system, the device name assigned to it may not be/dev/sda1, but may be/dev/sdb1. How can we keep it unchanged in any system? Of course there is a way, that is, the UUID unique identifier. Take a USB flash drive as an example. If a USB flash drive is divided into three zones, each zone is allocated with a UUID, which is recorded on the USB flash drive rather than in a system, in this way, the device names of the USB flash drive are different in different systems.
The following three commands can view the UUID:
1. ls-l/dev/disk/by-uuid/
This command can view all the device files with UUID in the system.
2. vol_id/dev/sdb1
View the volume ID of/dev/sdb1, that is, UUID
3. blkid/dev/sdb1
View the UUID of the block device/dev/sdb1. storage devices such as hard disks, USB disks, and optical disks are Block devices. You can use this command to view the UUID.
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