NAME
mount_hfs: mount, umount — mount and unmount HFS file systems
SYNOPSIS
/usr/sbin/mount
[-l]
[-p|-v]
/usr/sbin/mount
-a
[-F
hfs]
[-eQ]
[-f]
/usr/sbin/mount
[-F
hfs]
[-eQrV]
[-f]
[-o
specific_options]
{special|directory}
/usr/sbin/mount
[-F
hfs]
[-eQrV]
[-f]
[-o
specific_options]
special
directory
/usr/sbin/umount
-a
[-F
hfs]
[-v]
/usr/sbin/umount
[-v]
[-V]
{special|directory}
DESCRIPTION
The
mount
command mounts file systems.
Only
a superuser
can mount file systems.
Other users can use
mount
to list mounted file systems.
The
mount
command attaches
special,
a removable file system, to
directory,
a directory on the file tree.
directory,
which must already exist,
will become the name of the root of the newly mounted file system.
special
and
directory
must be given as absolute path names.
If either
special
or
directory
is omitted,
mount
attempts to determine the missing value from an entry in the
/etc/fstab
file.
mount
can be invoked on any removable file system, except
/.
If
mount
is invoked without any arguments,
it lists all of the mounted file systems from the file system mount table,
/etc/mnttab.
The
umount
command unmounts mounted file systems.
Only
a superuser
can unmount file systems.
Options (mount)
mount
recognizes the following options:
- -a
Attempt to mount all file systems described in
/etc/fstab.
All optional fields in
/etc/fstab
must be included and supported.
If
-F
hfs
is specified, all HFS file systems in
/etc/fstab
are mounted. If
noauto
is specified in an entry's option list, this entry is skipped.
File systems are not necessarily mounted in the order listed in
/etc/fstab.
- -e
Verbose mode.
Write a message to standard output
indicating which file system is being mounted.
- -f
Force the file system to be mounted,
even if the file system clean flag
indicates that the file system should have
fsck
run on it before mounting (see
fsck(1M)).
This option is valid only on HFS file systems.
- -F hfs
Specify the HFS file system type (see
fstyp(1M)).
- -l
Limit actions to local file systems only.
- -o specific_options
Specify options specific to the HFS file system type.
specific_options
is a list of comma separated suboptions and/or keyword/attribute pairs
intended for the HFS specific module of the command.
The following
specific_options
are valid on HFS file systems.
- defaults
Use all default options.
When given, this must be the only option specified.
- rw
Mount read-write (default).
- ro
Mount read-only.
- suid
Allow set-user-ID execution (default).
- nosuid
Do not allow set-user-ID execution.
- behind
Enable, where possible, asynchronous writes to disk.
- delayed
Enable delayed or buffered writes to disk.
This is the default.
- fs_async
Enable relaxed posting of file system metadata.
- no_fs_async
Enable rigorous posting of file system metadata.
This is the default.
- largefiles
Attempt to enable the creation of files greater than 2 gigabytes in size.
File systems have to be created or configured to enable large files (see
mkfs_hfs(1M)
and
fsadm_hfs(1M)).
- nolargefiles
Attempt to disable the creation of files greater than 2 gigabytes in size.
File systems have to be created or configured to disable large files. (see
mkfs_hfs(1M)
and
fsadm_hfs(1M)).
- quota
Enable user quotas
(valid only for
rw
file systems).
HFS supports user quotas only.
- noquota
Disable disk quotas (default).
Mounting with the
quota
option also enables quotas for the file system,
unlike some other systems,
which require the additional invocation of the
quotaon
command after the file system has been mounted (see
quotaon(1M)).
Running
quotaon
does no harm, but it is not necessary.
- -p
Report the list of mounted file systems in the
/etc/fstab
format.
- -Q
Prevent the display of error messages
resulting from an attempt to mount already mounted file systems.
- -r
Mount the specified file system as read-only.
This option is equivalent to the
-o ro
specific_option.
Physically write-protected file systems
must be mounted in this way
or errors occur when access times are updated,
whether or not any explicit write is attempted.
- -v
Report the regular output with file system type and flags;
however,
directory
and
special
fields are reversed.
- -V
Echo the completed command line, but performs no other action.
The command line is generated
by incorporating the user-specified options
and other information derived from
/etc/fstab.
This option allows the user to verify the command line.
Options (umount)
umount
recognizes the following options:
- -a
Attempt to unmount all file systems described in
/etc/mnttab.
All optional fields in
/etc/mnttab
must be included and supported.
If
-F
hfs
is specified, all HFS file systems in
/etc/mnttab
are unmounted.
File systems are not necessarily unmounted in the order listed in
/etc/mnttab.
- -F hfs
Specify the HFS file system type (see
fstyp(1M)).
- -v
Verbose mode.
Write a message to standard output
indicating which file system is being unmounted.
- -V
Echo the completed command line, but performs no other action.
The command line is generated
by incorporating the user-specified options
and other information derived from
/etc/fstab.
This option allows the user to verify the command line.
DIAGNOSTICS
umount
complains if the special file is not mounted or if it is busy.
The file system is busy if it contains an open file
or some logged-in user's working directory.
EXAMPLES
Mount a local HFS disk:
mount -F hfs /dev/disk/disk4 /usr
Unmount a local HFS disk:
WARNINGS
Some degree of validation is done on the file system, however, it is
generally unwise to mount file systems that are defective, corrupt,
or of unknown origin.
AUTHOR
mount
was developed by HP,
AT&T,
the University of California, Berkeley,
and Sun Microsystems.
FILES
- /etc/fstab
Static information about the file systems
- /etc/mnttab
Mounted file system table
SEE ALSO
fsadm_hfs(1M),
fsclean(1M),
mkfs_hfs(1M),
mount(1M),
quotaon(1M),
mount(2),
fstab(4),
mnttab(4),
fs_wrapper(5),
quota(5),
disk(7).
STANDARDS CONFORMANCE
mount: SVID3
umount: SVID3
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