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# Linux umount Command [ Linux Command Manual](#) The Linux umount (full English name: unmount) command is used to unmount a file system. umount can unmount file systems currently mounted in Linux directories. ### Syntax umount **Parameters**: * -a Unmount all file systems recorded in /etc/mtab. * -h Display help. * -n Do not write information to the /etc/mtab file when unmounting. * -r If unmounting fails, attempt to remount the file system as read-only. * -t Only unmount the file system specified in the option. * -v Display detailed information during execution. * -V Display version information. * In addition to directly specifying the file system, you can also use the device name or mount point to represent the file system. ### Examples The following two commands unmount the file system using the device name and mount point respectively, while outputting detailed information: # umount -v /dev/sda1 Unmount /dev/sda1 by device name umounted # umount -v /mnt/mymount/ Unmount /tmp/diskboot.img by mount point umounted If the device is busy, the unmount will fail. A common reason for unmount failure is that an open shell has its current directory set to a directory within the mount point: # umount -v /mnt/mymount/ umount: /mnt/mymount: device is busy umount: /mnt/mymount: device is busy [ Linux Command Manual](#)