mount(1M) Maintenance Commands 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 [ -V ] [ -o specific_options ]
special | mount_point
umount -a [ -V ] [ -o specific_options ] [
mount_point. . . ]
AVAILABILITY
SUNWcsr
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.
mount and umount maintain a table of mounted file systems in
/etc/mnttab, which is described in mnttab(4). mount adds an
entry to the mount table; 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 speci-
fied in /etc/default/fs will be used. Otherwise the default
remote file system type will be used. The default remote
file system 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 con-
sulting /etc/default/fs or /etc/dfs/fstypes.
-a [ mount_points. . . ]
Perform mount or umount operations in paral-
lel, 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 umount
all filesystems in /etc/mnttab, with the
exception of certain system required file
systems: /, /usr, /usr/kvm, /var, /proc,
/dev/fd, and /tmp.
-p Print the list of mounted file systems in
the /etc/vfstab format. Must be the only
option specified.
-v Print the list of mounted file systems in
verbose format. Must be the only option
specified.
-V Echo the complete command line, but do not
execute the command. umount generates a com-
mand 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 command line.
generic_options
Options that are commonly supported by most
FSType-specific command modules. The follow-
ing options are available:
-m Mount the file system without mak-
ing an entry in /etc/mnttab.
-r Mount the file system read-only.
-o Specify FSType-specific options in a comma
separated (without spaces) list of suboptions
and keyword-attribute pairs for interpreta-
tion by the FSType-specific module of the
command. (See mount_ufs(1M))
-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".
FILES
/etc/mnttab mount table
/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.
SEE ALSO
mount_cachefs(1M), mount_hsfs(1M), mount_nfs(1M),
mount_tmpfs(1M), mount_ufs(1M), mountall(1M), umountall(1M),
setmnt(1M), mnttab(4), vfstab(4), lofs(7), pcfs(7)
NOTES
A server should not attempt to mount its own filesystems
(see lofs(7)).
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.
SunOS 5.4 Last change: 24 Feb 1994