NFSv2/usr/man/man8/mount.8

Compare this file to the similar file:
Show the results in this format:
.\" @(#)mount.8 1.8 85/04/05 SMI; from UCB 4.2
.TH MOUNT 8 "12 March 1985"
.SH NAME
mount, umount \- mount and dismount filesystems
.SH SYNOPSIS
.B /etc/mount
.br
.B /etc/mount \-p
.br
.B /etc/mount
.BR \-a [ fv ][ t
type ]
.br
.B /etc/mount
[
.BR \-frv ][ to
type options ] [ fsname ] [ dir ]
.LP
.B /etc/umount
[
.B \-av
] [ fsname | dir ] ...
.SH DESCRIPTION
.IX  "mount command"  ""  "\fLmount\fP \(em mount file system"
.IX  "mount file system"  ""  "mount file system \(em \fLmount\fP"
.IX  "file system"  "mount"  ""  "mount \(em \fLmount\fP"
.IX  "umount command"  ""  "\fLumount\fP \(em unmount file system"
.IX  "unmount file system"  ""  "unmount file system \(em \fLumount\fP"
.IX  "demount file system"  ""  "demount file system \(em \fLumount\fP"
.IX  "file system"  "unmount"  ""  "unmount \(em \fLumount\fP"
.IX  "file system"  "demount"  ""  "demount \(em \fLumount\fP"
.I Mount
announces to the system that a filesystem
.I fsname
is to be attached to the file tree at the directory
.IR dir .
The directory
.I dir
must already exist.
It becomes the name of the newly mounted root.  The contents of
.I dir
are hidden until the filesystem is unmounted.
If
.I fsname
is of the form host:path the filesystem type is assumed to be
.IR nfs (4).
.LP
.I Umount
announces to the system that the filesystem 
.I fsname
previously mounted on directory
.I dir
should be removed.  Either the filesystem name or the mounted-on
directory may be used.
.LP
.I Mount
and
.I umount
maintain a table of mounted filesystems in
.IR /etc/mtab ,
described in
.IR mtab (5).
If invoked without an argument,
.I mount
displays the table.  If invoked with only one of
.I fsname
or
.I dir
mount searches
.I /etc/fstab
for an entry whose
.I dir
or
.I fsname
field matches the given argument.
For example,
.nf
	\fBmount\fP /usr
and
	\fBmount\fP /dev/xy0g
are shorthand for
	\fBmount\fP /dev/xy0g /usr
if this line is in \fI/etc/fstab\fR
	/dev/xy0g /usr 4.2 rw 1 1
.fi
.SH "MOUNT OPTIONS"
.TP
.B \-a
Attempt to mount all the filesystems described in
.IR /etc/fstab .
In this case,
.I fsname
and
.I dir
are taken from
.IR /etc/fstab .
If a type is specified all of the filesystems in
.I /etc/fstab
with that type will be mounted.
.TP
.B \-o
The next argument is a string that specifies mount options.
Valid options are: ro, rw, quota, noquota, hard, soft.
Hard and soft only make sense on
.IR nfs (4)
filesystems.  Options are separated by commas.
The options
.I ro
and
.I rw
stand for read-only and read-write;
.I rw
is the default.
Since quotas are not implemented,
.I noquota
is the default.
With a hard remote mount,
.I mount
tries forever if the
.IR mountd (8c)
server does not respond.
Once the filesystem is mounted,
access requests will retry forever if the
.IR nfsd (8)
server does not respond.
Hard is the default.
With a soft remote mount, if the
.IR mountd (8c)
server does not respond,
.I mount
forks a background copy to retry forever.
Once the soft mount completes,
access requests will fail with
.SM [ETIMEDOUT]
if the
.IR nfsd (8)
server does not respond.
.TP
.B \-r
Mount the specified filesystem read-only.  This is a shorthand for:
.br
	\fBmount \-o ro\fR fsname dir
.br
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.
.TP
.B \-t
The next argument is the filesystem type.
The accepted types are: 4.2, nfs, and pc; see
.IR fstab (5)
for a description of the legal filesystem types.
.TP
.B \-f
Fake a new
.I /etc/mtab
entry, but do not actually mount any filesystems.
.TP
.B \-p
Print the list of mounted filesystems in a format suitable for use in 
.IR /etc/fstab .
.TP
.B \-v
Verbose \(em
.I mount
displays a message indicating the filesystem being mounted.
.SH "UMOUNT OPTIONS"
.TP
.B \-a
Attempt to unmount all the filesystems currently mounted.
In this case,
.I fsname
is taken from
.IR /etc/mtab .
.TP
.B \-v
Verbose \(em
.I umount
displays a message indicating the filesystem being unmounted.
.SH EXAMPLES
.nf
.ta \w'mount \-o hard server:/usr/src /usr/src 'u
mount /dev/xy0g /usr            	mount a local disk
mount \-ft 4.2 /dev/nd0 /       	fake an entry for nd root
mount \-at 4.2                  	mount all 4.2 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	same as above but hard mount
mount \-p > /etc/fstab          	save current mount state
.fi
.SH FILES
.DT
/etc/mtab	mount table
.br
/etc/fstab	filesystem table
.SH "SEE ALSO"
mount(2), nfsmount(2), unmount(2), fstab(5), mountd(8c), nfsd(8c)
.SH BUGS
Mounting filesystems full of garbage will crash the system.
.LP
No more than one user should mount a disk partition "read-write" or
the file system may become corrupted.