How to use the umount command to unmount a file system under Linux

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Basic format of the command:

[root@localhost ~] # umount device file name or mount point

Note that you can add either a device file name or a mount point after the uninstall command, but you can only choose one of the two, such as:

[root@localhost ~] # umount / mnt/usb# uninstall USB disk [root@localhost ~] # umount / mnt/cdrom# uninstall CD [root@localhost ~] # umount / dev/sr0# command add device file name can also be uninstalled

If two are added (shown below), theoretically, the optical drive will be uninstalled twice, and of course, an error will be reported the second time.

[root@localhost ~] # mount / dev/sr0 / mnt/cdrom/

In addition, the following may occur when we uninstall:

[root@localhost ~] # cd / mnt/cdrom/# enters the CD mount point [root@localhost cdrom] # umount / mnt/cdrom/umount: / mnt/cdrom: device is busy.# reports an error. The device is busy.

This error occurs because we have entered the mount point, so if you want to uninstall a hardware device, the user must exit the mount directory before executing the umount command.

Whether the hardware device is uninstalled or not, in addition to executing the umount command without reporting errors, you can also use the df command or mount-l to see if the target device is still mounted on the system.

The above is all the contents of the article "how to unmount the file system using the umount command under Linux". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!