MOUNT

Section: Maintenance Commands (8)
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BSD mandoc
BSD 4  

NAME

mount umount - mount and dismount file systems  

SYNOPSIS

mount [-afrwuv ] [-t minix | ext | msdos ]
mount [-frwuv ] special | node
mount [-frwu ] [-t minix | ext | msdos | iso9660 | nfs ] [-o options ] special node
umount [-a ] [-t minix | ext | msdos | iso9660 | nfs ]
umount special | node  

DESCRIPTION

The mount command calls the mount(2) system call to prepare and graft a special device on to the file system tree at the point node. If either special or node are not provided, the appropriate information is taken from the fstab(5) file.

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

Options available for the mount command:

-f
Causes everything to be done except for the actual system call; if it's not obvious, this ``fakes'' mounting the file system. This option is useful in conjunction with the -v flag to determine what the mount command is trying to do.
-o
Options are specified with a -o flag followed by a comma separated string of options. The following options apply to any file system that is being mounted:

noexec
Do not allow execution of any binaries on the mounted file system. This options 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.
nodev
Do not interpret character or block special devices on the file system. This options is useful for a server that has file systems containing special devices for architectures other than its own.
remount
Attempt to remount an already-mounted filesystem. This is commonly used to change the mount flags for a filesystem, especially to make a readonly filesystem writeable.
synchronous
All I/O to the file system should be done synchronously.

-r
The file system object is to be mounted read-only.
-t minix \*(Ba ext \*(Ba msdos
The argument following the -t is used to indicate the file system type. The type minix is the default. For example, the mount command:
mount -a -t nomsdos,ext 

mounts all filesystems except those of type msdos and ext

-u
The -u flag indicates that the status of an already mounted file system should be changed. (Not yet implemented.) 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. The set of options is determined by first extracting the options for the file system from the fstab table, then applying any options specified by the -o argument, and finally applying the -r or -w option.

-v
Verbose mode.
-w
The file system object is to be read and write.

Umount removes the special device grafted at point node from file system tree.

Options for the umount command:

-a
All of the file systems described in mtab are unmounted.
-t
Is used to indicate 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 on which no action should be taken. (See example above for the mount command.)

 

FILES

/etc/fstab
file system table

 

SEE ALSO

mount(2), umount(2), fstab(5)  

BUGS

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

Linux doesn't support -u or -o synchronous yet.  

HISTORY

A mount command appeared in AT&T System v6 .


 

Index

NAME
SYNOPSIS
DESCRIPTION
FILES
SEE ALSO
BUGS
HISTORY

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Time: 11:30:37 GMT, December 08, 2024