NAME

mount, umount − mount and unmount file systems

SYNTAX

/etc/mount [ options ] [ special ] [ name ]
/etc/umount [ options ] [ special...  ] [ name ]

DESCRIPTION

The mount command makes the removable file system present on special available to the system by mounting it on directory, name.  If special is not specified, the mount command looks in /etc/fstab for an entry containing name and mounts the corresponding file system on it.  If neither special nor name are specified, however, the mount command merely display a list of currently mounted file systems.  The specified name must exist and must be a directory (unless the root of the mounted file system is not a directory).  It becomes the name of the newly mounted root. 

For Version 3.0, the ULTRIX-11 file system has a 1K-byte block size.  The 1K-byte block size makes the Version 3.0 ULTRIX-11 file system incompatible with many other UNIX file systems, including that used in V7M-11 Version 1.0 and ULTRIX-11 Version 2.0.  To ensure block size compatibility on all file system, therefore, the mount command checks each file system’s superblock before mounting it.  To access files from an incompatible file system, use the rawfs command. 

The umount command makes each file system previously mounted on special unavailable by unmounting it.  If only name is specified, the umount command looks in /etc/fstab for an entry containing name and unmounts the corresponding file system. 

Both the mount and umount commands maintain a table of currently mounted file systems. 

OPTIONS

-a Mounts or unmounts all file systems listed in /etc/fstab (mount and umount).  To allow for nested file systems mounts, unmounts are done in reverse order: last to first entry. 

-d Mounts the specified file system without checking its superblock for compatibility (mount only).  This option is primarily intended for system maintenance. 

-f Updates /etc/mtab, but does not mount the specified file systems (mount only). 

-r Mounts the specified file system read-only (mount only).  Physically write-protected and magnetic tape file systems must be mounted read-only or errors will occur when access times are updated, whether or not any explicit write is attempted. 

-v Displays verbose information while mounting or unmounting file systems (mount and umount). 

RESTRICTIONS

Only the superuser can mount and dismount file systems, while any user can list the mount table. 
Mounting invalid or incompatible file systems will crash the system.
Mounting a root directory on a non-directory makes some apparently good pathnames is invalid.

FILES

/etc/fstab - file system information table
/etc/mtab  - mount table

SEE ALSO

mount(2), fstab(5), mtab(5), rawfs(8)
ULTRIX-11 System Management Guide