18.3. Unmounting a File System
18.3. Unmounting a File System To detach a previously mounted file system, use either of the following variants of the umount command: Note that unless this is performed while logged in as root , the correct permissions must be available to unmount the file system (see Section 18.2.2, "Specifying the Mount Options" ). See Example 18.9, "Unmounting a CD" for an example usage. Important When a file system is in use (for example, when a process is reading a file on this file system, or when it is used by the kernel), running the umount command will fail with an error. To determine which processes are accessing the file system, use the fuser command in the following form: For example, to list the processes that are accessing a file system mounted to the /media/cdrom/ directory, type: Example 18.9. Unmounting a CD To unmount a CD that was previously mounted to the /media/cdrom/ directory, type the following at a shell prompt:
umount directory umount device fuser -m directory ~]USD fuser -m /media/cdrom /media/cdrom: 1793 2013 2022 2435 10532c 10672c ~]USD umount /media/cdrom