mount(1M)
NAME
mount, umount - mount or unmount file systems and remote
resources
SYNOPSIS
mount [-p | -v]
mount [-F FSType] [generic_options] [-o specific_options]
[-O] special | mount_point
mount [-F FSType] [generic_options] [-o specific_options]
[-O] special mount_point
mount -a [-F FSType] [-V] [current_options] [-
o specific_options] [mount_point...]
umount [-f] [-V] [-o specific_options] special | mount_point
umount -a [-f] [-V] [-o specific_options] [mount_point...]
DESCRIPTION
mount attaches a file system to the file system hierarchy at
the mount_point, which is the pathname of a directory. If
mount_point has any contents prior to the mount operation,
these are hidden until the file system is unmounted.
umount unmounts a currently mounted file system, which may
be specified either as a mount_point or as special, the dev-
ice on which the file system resides.
The table of currently mounted file systems can be found by
examining the mounted file system information file. This is
provided by a file system that is usually mounted on
/etc/mnttab. The mounted file system information is
described in mnttab(4). Mounting a file system adds an entry
to the mount table; a umount removes an entry from the
table.
When invoked with both the special and mount_point arguments
and the -F option, mount validates all arguments except for
special and invokes the appropriate FSType-specific mount
module. If invoked with no arguments, mount lists all the
mounted file systems recorded in the mount table,
/etc/mnttab. If invoked with a partial argument list (with
only one of special or mount_point, or with both special or
mount_point specified but not FSType), mount will search
/etc/vfstab for an entry that will supply the missing argu-
ments. If no entry is found, and the special argument starts
with "/", the default local file system type specified in
/etc/default/fs will be used. Otherwise the default remote
file system type will be used. The default remote file sys-
tem type is determined by the first entry in the
/etc/dfs/fstypes file. After filling in missing arguments,
mount will invoke the FSType-specific mount module.
Only a super-user can mount or unmount file systems using
mount and umount. However, any user can use mount to list
mounted file systems and resources.
OPTIONS
-F FSType
Used to specify the FSType on which to operate. The
FSType must be specified or must be determinable from
/etc/vfstab, or by consulting /etc/default/fs or
/etc/dfs/fstypes.
-a [ mount_points. . . ]
Perform mount or umount operations in parallel, when
possible.
If mount points are not specified, mount will mount
all file systems whose /etc/vfstab "mount at boot"
field is "yes". If mount points are specified, then
/etc/vfstab "mount at boot" field will be ignored.
If mount points are specified, umount will only umount
those mount points. If none is specified, then umount
will attempt to unmount all file systems in
/etc/mnttab, with the exception of certain system
required file systems: /, /usr, /var, /var/adm,
/var/run, /proc, /dev/fd and /tmp.
-f Forcibly unmount a file system.
Without this option, umount does not allow a file sys-
tem to be unmounted if a file on the file system is
busy. Using this option can cause data loss for open
files; programs which access files after the file sys-
tem has been unmounted will get an error (EIO).
-p Print the list of mounted file systems in the
/etc/vfstab format. Must be the only option specified.
See BUGS.
-v Print the list of mounted file systems in verbose for-
mat. Must be the only option specified.
-V Echo the complete command line, but do not execute the
command. umount generates a command line by using the
options and arguments provided by the user and adding
to them information derived from /etc/mnttab. This
option should be used to verify and validate the com-
mand line.
generic_options
Options that are commonly supported by most FSType-
specific command modules. The following options are
available:
-m Mount the file system without making an entry in
/etc/mnttab.
-g Globally mount the file system. On a clustered
system, this globally mounts the file system on
all nodes of the cluster. On a non-clustered
system this has no effect.
-o Specify FSType-specific options in a comma
separated (without spaces) list of suboptions
and keyword-attribute pairs for interpretation
by the FSType-specific module of the command.
(See mount_ufs(1M).) When you use -o with a file
system that has an entry in /etc/vfstab, any
mount options entered for that file system in
/etc/vfstab are ignored.
-O Overlay mount. Allow the file system to be
mounted over an existing mount point, making the
underlying file system inaccessible. If a mount
is attempted on a pre-existing mount point
without setting this flag, the mount will fail,
producing the error "device busy".
-r Mount the file system read-only.
USAGE
See largefile(5) for the description of the behavior of
mount and umount when encountering files greater than or
equal to 2 Gbyte ( 2**31 bytes).
FILES
/etc/mnttab
Table of mounted file systems.
/etc/default/fs
Default local file system type. Default values can be
set for the following flags in /etc/default/fs. For
example: LOCAL=ufs
LOCAL:
The default partition for a command if no FSType
is specified.
/etc/vfstab
List of default parameters for each file system.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
mount_cachefs(1M), mount_hsfs(1M), mount_nfs(1M),
mount_pcfs(1M), mount_tmpfs(1M), mount_ufs(1M),
mountall(1M), umountall(1M), mnttab(4), vfstab(4), attri-
butes( 5), largefile(5), lofs(7FS), pcfs(7FS)
NOTES
If the directory on which a file system is to be mounted is
a symbolic link, the file system is mounted on the directory
to which the symbolic link refers, rather than on top of the
symbolic link itself.
BUGS
The mount -p output is incorrect for cachefs.
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