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mount(1M)		System Administration Commands		     mount(1M)

NAME
       mount, umount - mount or unmount file systems and remote resources

SYNOPSIS
       mount [-p | -v]

       mount [-F FSType] [generic_options] [-o specific_options]
	    [-O] special | mount_point

       mount [-F FSType] [generic_options] [-o specific_options]
	    [-O] special mount_point

       mount -a [-F FSType] [-V] [current_options]
	    [-o specific_options] [mount_point]...

       umount [-f] [-V] [-o specific_options] special | mount_point

       umount -a [-f] [-V] [-o specific_options] [mount_point]...

DESCRIPTION
       mount  attaches	a  file	 system	 to  the  file system hierarchy at the
       mount_point, which is the pathname of a directory. If  mount_point  has
       any  contents  prior to the mount operation, these are hidden until the
       file system is unmounted.

       umount unmounts a currently mounted file system, which may be specified
       either  as  a  mount_point  or as special, the device on which the file
       system resides.

       The table of currently mounted file systems can be found	 by  examining
       the  mounted  file  system information file. This is provided by a file
       system that is usually mounted on /etc/mnttab. The mounted file	system
       information  is	described in mnttab(4). Mounting a file system adds an
       entry to the mount table; a umount removes an entry from the table.

       When invoked with both the special and mount_point arguments and the -F
       option,	mount  validates  all arguments except for special and invokes
       the appropriate FSType-specific mount module. If invoked with no	 argu‐
       ments,  mount  lists all the mounted file systems recorded in the mount
       table, /etc/mnttab. If invoked with a partial argument list (with  only
       one  of	special	 or  mount_point,  or with both special or mount_point
       specified but not FSType), mount will search /etc/vfstab for  an	 entry
       that  will  supply the missing arguments. If no entry is found, and the
       special argument starts with "/", the default local  file  system  type
       specified in /etc/default/fs will be used. Otherwise the default remote
       file system type will be used. The default remote file system  type  is
       determined by the first entry in the /etc/dfs/fstypes file. After fill‐
       ing in missing arguments, mount will invoke the	FSType-specific	 mount
       module.

       Only  a	super-user  can	 mount or unmount file systems using mount and
       umount. However, any user can use mount to list	mounted	 file  systems
       and resources.

OPTIONS
       -F FSType

	   Used	 to specify the FSType on which to operate. The FSType must be
	   specified or must be determinable from /etc/vfstab, or by  consult‐
	   ing /etc/default/fs or /etc/dfs/fstypes.

       -a [ mount_points. . . ]

	   Perform mount or umount operations in parallel, when possible.

	   If  mount  points are not specified, mount will mount all file sys‐
	   tems whose /etc/vfstab "mount at boot" field	 is  "yes".  If	 mount
	   points  are	specified, then /etc/vfstab "mount at boot" field will
	   be ignored.

	   If mount points are specified, umount will only umount those	 mount
	   points.  If	none is specified, then umount will attempt to unmount
	   all file systems in /etc/mnttab, with the exception of certain sys‐
	   tem	required  file	systems:  /,  /usr,  /var, /var/adm, /var/run,
	   /proc, /dev/fd and /tmp.

       -f

	   Forcibly unmount a file system.

	   Without this option, umount does not allow  a  file	system	to  be
	   unmounted  if  a file on the file system is busy. Using this option
	   can cause data loss for open files;	programs  which	 access	 files
	   after the file system has been unmounted will get an error (EIO).

       -p

	   Print  the  list of mounted file systems in the /etc/vfstab format.
	   Must be the only option specified. See BUGS.

       -v

	   Print the list of mounted file systems in verbose format.  Must  be
	   the only option specified.

       -V

	   Echo	 the  complete	command	 line, but do not execute the command.
	   umount generates a command line by using the options and  arguments
	   provided  by	 the  user and adding to them information derived from
	   /etc/mnttab. This option should be used to verify and validate  the
	   command line.

       generic_options

	   Options that are commonly supported by most FSType-specific command
	   modules. The following options are available:

	   -m

	       Mount the file system without making an entry in /etc/mnttab.

	   -g

	       Globally mount the file system. On  a  clustered	 system,  this
	       globally mounts the file system on all nodes of the cluster. On
	       a non-clustered system this has no effect.

	   -o

	       Specify FSType-specific options in a comma  separated  (without
	       spaces)	list  of  suboptions  and  keyword-attribute pairs for
	       interpretation by the FSType-specific module  of	 the  command.
	       (See  mount_ufs(1M).)  When  you use -o with a file system that
	       has an entry in /etc/vfstab, any mount options entered for that
	       file system in /etc/vfstab are ignored.

	       The following options are supported:

	       devices | nodevices

		   Allow  or disallow the opening of device-special files. The
		   default is devices.

		   If you use nosuid in conjunction with devices, the behavior
		   is equivalent to that of nosuid.

	       exec | noexec

		   Allow  or  disallow	executing programs in the file system.
		   Allow or disallow mmap(2) with PROT_EXEC for	 files	within
		   the file system. The default is exec.

	       nbmand | nonbmand

		   Allow  or disallow non-blocking mandatory locking semantics
		   on this file system. Non-blocking mandatory locking is dis‐
		   allowed by default.

		   If  the file system is mounted with the nbmand option, then
		   applications can use the fcntl(2) interface to  place  non-
		   blocking  mandatory	locks on files and the system enforces
		   those semantics. If you enable this option,	it  can	 cause
		   standards conformant applications to see unexpected errors.

		   Do not use the nbmand option with /, /var and /usr.

		   You	should not use the remount option to change the nbmand
		   disposition of the file system. The nbmand option is	 mutu‐
		   ally exclusive of the global option. See -g.

	       ro | rw

		   Specify read-only or read-write. The default is rw.

	       setuid | nosetuid

		   Allow  or  disallow setuid or setgid execution. The default
		   is setuid.

		   If you specify  setuid  in  conjunction  with  nosuid,  the
		   behavior is the same as nosuid.

		   nosuid  is  equivalent to nosetuid and nodevices. When suid
		   or nosuid is combined with setuid or nosetuid  and  devices
		   or nodevices, the most restrictive options take effect.

		   This	 option is highly recommended whenever the file system
		   is shared by way of NFS with the root= option. Without  it,
		   NFS clients could add setuid programs to the server or cre‐
		   ate devices that could open security holes.

	       suid | nosuid

		   Allow or disallow setuid or setgid execution.  The  default
		   is  suid.  This option also allows or disallows opening any
		   device-special entries that appear within the filesystem.

		   nosuid is equivalent to nosetuid and nodevices.  When  suid
		   or  nosuid  is combined with setuid or nosetuid and devices
		   or nodevices, the most restrictive options take effect.

		   This option is highly recommended whenever the file	system
		   is  shared using NFS with the root=option, because, without
		   it, NFS clients could add setuid programs to the server, or
		   create devices that could open security holes.

	       rstchown | norstchown

		   Allow  or  disallow restricted chown. If the file system is
		   mounted with rstchown, the owner of the file	 is  prevented
		   from	 changing the owner ID of the file. If the file system
		   is mounted with norstchown, the user can  permit  ownership
		   changes  for	 files	they own. Only the superuser or a user
		   with appropriate privilege  can  arbitrarily	 change	 owner
		   IDs.

	   -O

	       Overlay	mount.	Allow  the  file  system to be mounted over an
	       existing mount point, making the underlying file	 system	 inac‐
	       cessible. If a mount is attempted on a pre-existing mount point
	       without setting this flag, the mount will fail,	producing  the
	       error "device busy".

	   -r

	       Mount the file system read-only.

USAGE
       See  largefile(5)  for  the  description	 of  the behavior of mount and
       umount when encountering files greater than or equal to 2 Gbyte (  2^31
       bytes).

FILES
       /etc/mnttab

	   Table of mounted file systems.

       /etc/default/fs

	   Default  local  file system type. Default values can be set for the
	   following flags in /etc/default/fs. For example: LOCAL=ufs

	   LOCAL:

	       The default partition for a command if no FSType is specified.

       /etc/vfstab

	   List of default parameters for each file system.

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

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │SUNWcsu			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       mount_cachefs(1M),   mount_hsfs(1M),   mount_nfs(1M),   mount_pcfs(1M),
       mount_tmpfs(1M),	 mount_ufs(1M), mountall(1M), umountall(1M), fcntl(2),
       mmap(2), mnttab(4), vfstab(4), attributes( 5), largefile(5), lofs(7FS),
       pcfs(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 symbolic
       link refers, rather than on top of the symbolic link itself.

BUGS
       The mount -p output is incorrect for cachefs.

SunOS 5.10			  1 Mar 2011			     mount(1M)
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