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MOUNT(8)		  BSD System Manager's Manual		      MOUNT(8)

NAME
     mount -- mount file systems

SYNOPSIS
     mount [-adfruvw] [-t ufs |	lfs | external_type]
     mount [-dfruvw] special | node
     mount [-dfruvw] [-o options] [-t ufs | lfs	| external_type] special node

DESCRIPTION
     The mount command calls the mount(2) system call to prepare and graft a
     special device or the remote node (rhost:path) on to the file system tree
     at	the point node.	 If either special or node are not provided, the ap-
     propriate 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	     All the filesystems described in fstab(5) are mounted.  Excep-
	     tions are those marked as ``noauto'' or are excluded by the -t
	     flag (see below).

     -d	     Causes everything to be done except for the actual	system call.
	     This option is useful in conjunction with the -v flag to deter-
	     mine what the mount command is trying 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 sepa-
	     rated string of options.  The following options are available:

	     async   All I/O to	the file system	should be done asynchronously.
		     This can be somewhat dangerous with respect to losing
		     data when faced with system crashes and power outages.
		     This is also the default.	It can be avoided with the
		     noasync option.

	     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.

	     noasync
		     This filesystem should not	force all I/O to be written
		     asynchronously.

	     noauto  This filesystem should be skipped when mount is run with
		     the -a flag.

	     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 filesystem type that is not
	     one of the	internally known types (see the	-t option) may be
	     passed as a comma separated list; these options 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 hfs	-o nosuid,-w,-m=755 /dev/disk2s9 /tmp

	     causes mount to execute the equivalent of:

		   /sbin/mount_hfs -o nosuid -w	-m 755 /dev/disk2s9 /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.

     -t	ufs | lfs | external type
	     The argument following the	-t is used to indicate the file	system
	     type.  The	type ufs 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 action
	     should not	be taken.  For example,	the mount command:

		   mount -a -t nonfs,hfs

	     mounts all	filesystems except those of type NFS and HFS.

	     If	the type is not	one of the internally known types, mount will
	     attempt to	execute	a program in /sbin/mount_XXX where XXX is re-
	     placed 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 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 NFS filesystems are described in the
	     mount_nfs(8) manual page.

FILES
     /etc/fstab	 file system table

SEE ALSO
     mount(2), fstab(5), mount_afp(8), mount_cd9660(8),	mount_cddafs(8),
     mount_devfs(8), mount_fdesc(8), mount_hfs(8), mount_msdos(8),
     mount_nfs(8), mount_smbfs(8), mount_synthfs(8), mount_udf(8),
     mount_volfs(8), mount_webdav(8), umount(8)

BUGS
     It	is possible for	a corrupted file system	to cause a crash.

HISTORY
     A mount command appeared in Version 6 AT&T	UNIX.

4th Berkeley Distribution	 June 16, 1994	     4th Berkeley Distribution

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | BUGS | HISTORY

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