MOUNT man page on Darwin

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

NAME
     mount — mount file systems

SYNOPSIS
     mount [-adfruvw] [-t lfs | external_type]
     mount [-dfruvw] special | node
     mount [-dfruvw] [-o options] [-t 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
     appropriate information is obtained via the getfsent(3) library routines.

     The system maintains a list of currently mounted file systems.  If no
     arguments are given to mount, this list is printed.

     The options are as follows:

     -a	     All the filesystems listed via getfsent(3) are mounted.  Excep‐
	     tions are those marked as ``noauto;'' excluded by the -t flag
	     (see below); entries that are neither ``ro,'' ``rw,'' or ``rq;''
	     ``nfs'' entries that also have ``net'' as an option; and already-
	     mounted ``nfs'' entries.

     -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.

	     noowners
		     Ignore the ownership field for the entire volume.	This
		     causes all objects to appear as owned by user ID 99 and
		     group ID 99.  User ID 99 is interpreted as the current
		     effective user ID, while group ID 99 is used directly and
		     translates to ``unknown''.

	     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 to appear as the union of directo‐
		     ries of the mounted filesystem with corresponding direc‐
		     tories in the underlying filesystem.  Lookups will be
		     done in the mounted filesystem first.  If those opera‐
		     tions fail due to a non-existent file the underlying
		     directory is then accessed.

	     noatime
		     Do not update the file access time when reading from a
		     file.  This option is useful on file systems where there
		     are large numbers of files and performance is more criti‐
		     cal than updating the file access time (which is rarely
		     ever important).

	     nobrowse
		     This option indicates that the mount point should not be
		     visible via the GUI (i.e., appear on the Desktop as a
		     separate volume).

	     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	     Mount the file system read-only (even the super-user may not
	     write it).	 The same as the “rdonly” argument to the -o option.

     -t lfs | external type
	     The argument following the -t is used to indicate the file system
	     type.  There is no default local file system for use with mount.
	     A type must be specified in order to mount a non-NFS filesystem.
	     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 prefixed with “no” to specify the
	     filesystem types for which action should not be taken.  For exam‐
	     ple, 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
	     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
	     extracting the options for the file system from the filesystem
	     table (see getfsent(3)) then applying any options specified by
	     the -o argument, and finally applying the -r or -w option.

     -v	     Verbose mode.

     -w	     Mount the file system read-write.

	     The options specific to NFS filesystems are described in the
	     mount_nfs(8) manual page.

SEE ALSO
     mount(2), getfsent(3), mount_afp(8), mount_cd9660(8), mount_cddafs(8),
     mount_fdesc(8), mount_hfs(8), mount_msdos(8), mount_nfs(8),
     mount_smbfs(8), mount_udf(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
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