Search all pages
Professions, Sciences, Humanities, Business, ...
Text-based, GUI, Audio, Video, Keyboards, Mouse, Images,...
Conversions, tests, processing, manipulation,...
Integer, Floating point, Matrix, Statistics, Boolean, ...
Algorithms, Memory, Process control, Debugging, ...
Data storage, Integrity, Encryption, Compression, ...
Networks, protocols, Interprocess, Remote, Client Server, ...
Timing, Calendar and Clock, Audio, Video, Printer, Controls...
Management, Filtering, File & Directory access, Viewers, ...
RocketLink!--> Man page versions:
MOUNT(8) OpenBSD System Manager's Manual MOUNT(8)
mount - mount file systems
mount [-Aadfruvw] [-t type]
mount [-dfruvw] special | node
mount [-dfruvw] [-o options] [-t type] special node
The mount command invokes a filesystem-specific program to prepare and
graft the special device or remote node (rhost:path) on to the file sys-
tem tree at the point node. If either special or node are not provided,
the appropriate information is taken from the fstab(5) file.
The system maintains a list of currently mounted file systems. If no ar-
guments are given to mount, this list is printed.
The options are as follows:
-A Causes mount to try to mount all of the file systems listed in
the fstab(5) table except those for which the ``noauto'' option
-a Similar to the -A flag, except that if a file system (other than
the root file system) appears to be already mounted, mount will
not try to mount it again. Mount assumes that a file system is
already mounted if a file system with the same type is mounted on
the given mount point. More stringent checks are not possible
because some file system types report strange values for the
mounted-from device for mounted file systems.
-d Causes everything to be done except for the invocation of the
filesystem-specific program. This option is useful in conjunc-
tion with the -v flag to determine what the mount command is try-
ing to do.
-f Forces the revocation of write access when trying to downgrade a
filesystem mount status from read-write to read-only.
-o Options are specified with a -o flag followed by a comma separat-
ed string of options. The following options are available:
async All I/O to the file system should be done asynchronously.
This is a dangerous flag to set, and should not be used
unless you are prepared to recreate the file system
should your system crash.
force The same as -f; forces the revocation of write access
when trying to downgrade a filesystem mount status from
read-write to read-only.
Do not update atime on files in the system unless the
mtime or ctime is being changed as well. This option is
useful for laptops and news servers where one does not
want the extra disk activity associated with updating the
Synonym for noatime provided for compatibility with other
nodev Do not interpret character or block special devices on
the file system. This option is useful for a server that
has file systems containing special devices for architec-
tures other than its own.
noexec Do not allow execution of any binaries on the mounted
file system. This option is useful for a server that has
file systems containing binaries for architectures other
than its own.
nosuid Do not allow set-user-identifier or set-group-identifier
bits to take effect.
rdonly The same as -r; mount the file system read-only (even the
super-user may not write it).
sync All I/O to the file system should be done synchronously.
update The same as -u; indicate that the status of an already
mounted file system should be changed.
union Causes the namespace at the mount point to appear as the
union of the mounted filesystem root and the existing di-
rectory. Lookups will be done in the mounted filesystem
first. If those operations fail due to a non-existent
file the underlying directory is then accessed. All cre-
ates are done in the mounted filesystem.
Any additional options specific to a given filesystem type (see
the -t option) may be passed as a comma separated list; these op-
tions are distinguished by a leading ``-'' (dash). Options that
take a value are specified using the syntax -option=value. For
example, the mount command:
mount -t mfs -o nosuid,-N,-s=4000 /dev/dk0b /tmp
causes mount to execute the equivalent of:
/sbin/mount_mfs -o nosuid -N -s 4000 /dev/dk0b /tmp
-r The file system is to be mounted read-only. Mount the file sys-
tem read-only (even the super-user may not write it). The same
as the ``rdonly'' argument to the -o option.
The argument following the -t is used to indicate the file system
type. The type ffs is the default. The -t option can be used to
indicate that 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 pre-
fixed with ``no'' to specify the filesystem types for which ac-
tion should not be taken. For example, the mount command:
mount -a -t nonfs,mfs
mounts all filesystems except those of type NFS and MFS.
Mount will attempt to execute a program in /sbin/mount_XXX where
XXX is replaced by the type name. For example, nfs filesystems
are mounted by the program /sbin/mount_nfs.
-u The -u flag indicates that the status of an already mounted file
system should be changed. Any of the options discussed above
(the -o option) may be changed; also a file system can be changed
from read-only to read-write or vice versa. An attempt to change
from read-write to read-only will fail if any files on the
filesystem are currently open for writing unless the -f flag is
also specified. The set of options is determined by first ex-
tracting the options for the file system from the fstab(5) table,
then applying any options specified by the -o argument, and fi-
nally applying the -r or -w option.
-v Verbose mode.
-w The file system object is to be read and write.
The options specific to the various file system types are described in
the manual pages for those file systems' mount_XXX commands. For in-
stance the options specific to Berkekely Fast File Systems are described
in the mount_ffs(8) manual page.
/etc/fstab file system table
mount(2), fstab(5), mount_ados(8), mount_cd9660(8), mount_fdesc(8),
mount_ffs(8), mount_kernfs(8), mount_lfs(8), mount_mfs(8),
mount_msdos(8), mount_nfs(8), mount_null(8), mount_portal(8),
mount_procfs(8), mount_umap(8), mount_union(8), umount(8)
A mount command appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution March 27, 1994 3
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
FreeBSD Sources for mount(8)
OpenBSD sources for mount(8)
Up to: File System Operations - Operations for entire file-systems (quotas, configuration, consistency, mount, unmount, et al)
RocketLink!--> Man page versions:
Search | About | Comments | Submit Path: RocketAware > man pages >
RocketAware.com is a service of Mib Software
Copyright 1999, Forrest J. Cavalier III. All Rights Reserved.
We welcome submissions and comments