Supplemental Note: Umount can dismount the file system currently attached to the Linux directory.
Parameters: -A dismount all file systems recorded in the/etc/mtab. -h displays Help. Do not save the information in the/etc/mtab file when-n dismount. -R attempts to reseat the file system in a read-only manner if the removal cannot be successful. -t< file System type > Remove only the file system specified in the option. -V displays detailed information when executing. -V Displays version information. The file system can also represent the file system with a device name or a mount point, in addition to specifying the file system directly.
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