mount(1M) mount(1M)
NAME
mount, umount - mount and dismount filesystems
SYNOPSIS
/etc/mount
/etc/mount -p
/etc/mount -a [fv][ttype]
/etc/mount [-frv] [to type options] [fsname][dir]
/etc/umount [-av] [fsname|dir]...
DESCRIPTION
mount announces to the system that a filesystem fsname is to
be attached to the file tree at the directory dir. The
directory dir must already exist. It becomes the name of
the newly mounted root. The contents of dir are hidden
until the filesystem is unmounted. If fsname is of the form
host:path the filesystem type is assumed to be NFS.
Umount announces to the system that the filesystem fsname
previously mounted on directory dir should be removed.
Either the filesystem name or the mounted-on directory may
be used.
mount and umount maintain a table of mounted filesystems in
/etc/mtab, described in mtab(4). If invoked without an
argument, mount displays the table. If invoked with only
one of fsname or dir mount searches /etc/fstab for an entry
whose dir or fsname field matches the given argument. For
example,
mount /usr
and
mount /dev/xy0g
are shorthand for
mount /dev/xy0g /usr
if this line is in /etc/fstab
/dev/xy0g /usr 5.2 rw 1 1
MOUNT FLAG OPTIONS
-a Attempt to mount all the filesystems described in
/etc/fstab. In this case, fsname and dir are taken
from /etc/fstab. If a type is specified all of the
filesystems in /etc/fstab with that type will be
mounted.
-o The next argument is a string that specifies mount flag
options. Valid flag options are: ro,rw,quota,
noquota,hard,soft. hard andsoft only make sense on NFS
filesystems. Flag options are separated by commas.
The flag options ro and rw stand for read-only and
read-write; rw is the default. Since quotas are not
implemented, noquota is the default. With a hard
remote mount, mount tries forever if the mountd(8C)
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server does not respond. Once the filesystem is
mounted, access requests will retry forever if the
nfsd(8C) server does not respond. hard is the default.
With a soft remote mount, if the mountd(8C) server does
not respond, mount forks a background copy to retry
forever. Once the soft mount completes, access
requests will fail with [ETIMEDOUT] if the nfsd(8C)
server does not respond.
-r mount the specified filesystem read-only. This is a
shorthand for:
mount -o ro fsname dir
Physically write-protected and magnetic tape
filesystems must be mounted read-only, or errors will
occur when access times are updated, whether or not any
explicit write is attempted.
-t The next argument is the filesystem type. The accepted
types are: 4.2,5.2,nfs, andpc; see fstab(4) for a
description of the legal filesystem types.
-f Fake a new /etc/mtab entry, but do not actually mount
any filesystems.
-p Print the list of mounted filesystems in a format
suitable for use in /etc/fstab.
-v Verbose - mount displays a message indicating the
filesystem being mounted.
UMOUNT FLAG OPTIONS
-a Attempt to unmount all the filesystems currently
mounted. In this case, fsname is taken from /etc/mtab.
-v Verbose - umount displays a message indicating the
filesystem being unmounted.
EXAMPLES
mount /dev/xy0g /usr
mount a local disk
mount -at 5.2
mount all 5.2 filesystems
mount -t nfs serv:/usr/src /usr/src
mount remote filesystem
mount serv:/usr/src /usr/src
same as above
mount -o hard serv:/usr/src /usr/src
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mount(1M) mount(1M)
same as above but hard mount
mount -p > /etc/fstab
save current mount state
FILES
/etc/mount
/etc/umount
/etc/mtab
/etc/fstab
SEE ALSO
mount(2), nfsmount(2), umount(2), fstab(4), mountd(1M),
nfsd(1M).
BUGS
Mounting filesystems full of garbage will crash the system.
No more than one user should mount a disk partition ``read-
write'' or the file system may become corrupted.
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