umount(8) [opendarwin man page]
UMOUNT(8) BSD System Manager's Manual UMOUNT(8) NAME
umount -- unmount filesystems SYNOPSIS
umount [-fv] special | node umount -a | -A [-fv] [-h host] [-t type] DESCRIPTION
The umount command calls the unmount(2) system call to remove a special device or the remote node (rhost:path) from the filesystem tree at the point node. If either special or node are not provided, the appropriate information is taken from the fstab(5) file. The options are as follows: -a All the filesystems described in fstab(5) are unmounted. -A All the currently mounted filesystems except the root are unmounted. -f The filesystem is forcibly unmounted. Active special devices continue to work, but all other files return errors if further accesses are attempted. The root filesystem cannot be forcibly unmounted. -h host Only filesystems mounted from the specified host will be unmounted. This option is implies the -A option and, unless otherwise spec- ified with the -t option, will only unmount NFS filesystems. -t type Is used to indicate the actions should only be taken on filesystems of the specified type. More than one type may be specified in a comma separated list. The list of filesystem types can be prefixed with ``no'' to specify the filesystem types for which action should not be taken. For example, the umount command: umount -a -t nfs,hfs umounts all filesystems of the type NFS and HFS. -v Verbose, additional information is printed out as each filesystem is unmounted. FILES
/etc/fstab filesystem table SEE ALSO
unmount(2), fstab(5), mount(8) HISTORY
A umount command appeared in Version 6 AT&T UNIX. 4th Berkeley Distribution May 8, 1995 4th Berkeley Distribution
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UMOUNT(8) BSD System Manager's Manual UMOUNT(8) NAME
umount -- unmount file systems SYNOPSIS
umount [-fv] special ... | node ... | fsid ... umount -a | -A [-F fstab] [-fv] [-h host] [-t type] DESCRIPTION
The umount utility calls the unmount(2) system call to remove a file system from the file system tree. The file system can be specified by its special device or remote node (rhost:path), the path to the mount point node or by the file system ID fsid as reported by ``mount -v'' when run by root. The options are as follows: -a All the file systems described in fstab(5) are unmounted. -A All the currently mounted file systems except the root are unmounted. -F fstab Specify the fstab file to use. -f The file system is forcibly unmounted. Active special devices continue to work, but all other files return errors if further accesses are attempted. The root file system cannot be forcibly unmounted. For NFS, a forced dismount can take up to 1 minute or more to complete against an unresponsive server and may throw away data not yet written to the server for this case. -h host Only file systems mounted from the specified host will be unmounted. This option implies the -A option and, unless otherwise speci- fied with the -t option, will only unmount NFS file systems. -t type Is used to indicate the actions should only be taken on file systems of the specified type. More than one type may be specified in a comma separated list. The list of file system types can be prefixed with ``no'' to specify the file system types for which action should not be taken. For example, the umount command: umount -a -t nfs,nullfs unmounts all file systems of the type NFS and NULLFS that are listed in the fstab(5) file. -v Verbose, additional information is printed out as each file system is unmounted. ENVIRONMENT
PATH_FSTAB If the environment variable PATH_FSTAB is set, all operations are performed against the specified file. PATH_FSTAB will not be honored if the process environment or memory address space is considered ``tainted''. (See issetugid(2) for more information.) FILES
/etc/fstab file system table SEE ALSO
unmount(2), fstab(5), autounmountd(8), mount(8) HISTORY
A umount utility appeared in Version 6 AT&T UNIX. BSD
November 22, 2014 BSD