how to selectively mount FS?

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LEARN ABOUT OSX

mount_tmpfs

mount_tmpfs(1M) 					  System Administration Commands					   mount_tmpfs(1M)

NAME

       mount_tmpfs - mount tmpfs file systems

SYNOPSIS

       mount [ -F tmpfs] [ -o specific_options] [-O] special mount_point

DESCRIPTION

       tmpfs is a memory based file system which uses kernel resources relating to the VM system and page cache as a file system.

       mount  attaches	a  tmpfs  file	system	to  the  file  system hierarchy at the pathname location mount_point, which must already exist. If
       mount_point has any contents prior to the mount operation, these remain	hidden	until  the  file  system  is  once  again  unmounted.  The
       attributes  (mode, owner, and group) of the root of the tmpfs filesystem are inherited from the underlying mount_point, provided that those
       attributes are determinable. If not, the root's attributes are set to their default values.

       The special argument is usually specified as swap but is in fact disregarded and assumed to be the virtual memory resources within the sys-
       tem.

OPTIONS

       -o specific_options     Specify tmpfs file system specific options in a comma-separated list with no intervening spaces. If invalid options
			       are specified, a warning  message is printed and the invalid options are ignored. The following options are  avail-
			       able:

			       size=sz	       The  sz	argument  controls the size of this particular tmpfs file system. If the argument is has a
					       `k' suffix, the number will be interpreted as a number of kilobytes. An `m' suffix will	be  inter-
					       preted  as  a number of megabytes. No suffix is interpreted as bytes. In all cases, the actual size
					       of the file system is the number of bytes specified, rounded up to the  physical  pagesize  of  the
					       system.

			       xattr | noxattr Allow  or  disallow the creation and manipulation of extended attributes. The default is xattr. See
					       fsattr(5) for a description of extended attributes.

       -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 errordevice busy.

FILES

       /etc/mnttab     Table of mounted file systems

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mount(1M), mkdir(2), mount(2), open(2), umount(2), mnttab(4), attributes(5), fsattr(5), tmpfs(7FS)

NOTES

       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  sym-
       bolic link refers, rather than on top of the symbolic link itself.

SunOS 5.10							    24 Nov 2003 						   mount_tmpfs(1M)

Shell Programming and Scripting