.B mount
command, is
.RS
+
.br
.BI "mount \-t" " type device dir"
+.br
+
.RE
This tells the kernel to attach the file system found on
.I device
refers to the root of the file system on
.IR device .
-Three forms of invocation do not actually mount anything:
+.B The listing and help.
.RS
-.br
+Three forms of invocation do not actually mount anything:
+.TP
.B "mount \-h"
-.RE
-prints a help message;
-.RS
-.br
+prints a help message
+.TP
.B "mount \-V"
-.RE
-prints a version string; and just
-.RS
+prints a version string
+.TP
.BI "mount [-l] [-t" " type" ]
-.RE
lists all mounted file systems (of type
.IR type ).
The option \-l adds the (ext2, ext3 and XFS) labels in this listing.
See below.
+.RE
+.B The bind mounts.
+.RS
.\" In fact since 2.3.99. At first the syntax was mount -t bind.
Since Linux 2.4.0 it is possible to remount part of the
file hierarchy somewhere else. The call is
.br
.B "/olddir /newdir none bind"
.RE
+
After this call the same contents is accessible in two places.
One can also remount a single file (on a single file).
Note that the filesystem mount options will remain the same as those
on the original mount point, and cannot be changed by passing the -o
option along with --bind/--rbind.
+.RE
+.B The move operation.
+.RS
Since Linux 2.5.1 it is possible to atomically move a mounted tree
to another place. The call is
.RS
.br
.B "mount -M olddir newdir"
.RE
+.RE
+.B The shared subtrees operations.
+.RS
Since Linux 2.6.15 it is possible to mark a mount and its submounts as shared,
private, slave or unbindable. A shared mount provides ability to create mirrors
of that mount such that mounts and umounts within any of the mirrors propagate
"mount --make-runbindable mountpoint"
.br
.RE
+.RE
+
+.B The device indication.
+.RS
+Most devices are indicated by a file name (of a block special device), like
+.IR /dev/sda1 ,
+but there are other possibilities. For example, in the case of an NFS mount,
+.I device
+may look like
+.IR knuth.cwi.nl:/dir .
+It is possible to indicate a block special device using its
+volume
+.B LABEL
+or
+.B UUID
+(see the \-L and \-U options below).
The
.I proc
is less fortunate: the error message `none busy' from
.B umount
can be confusing.)
+.RE
-Most devices are indicated by a file name (of a block special device), like
-.IR /dev/sda1 ,
-but there are other possibilities. For example, in the case of an NFS mount,
-.I device
-may look like
-.IR knuth.cwi.nl:/dir .
-It is possible to indicate a block special device using its
-volume label or UUID (see the \-L and \-U options below).
-
+.B The /etc/fstab, /etc/mtab and /proc/mounts files.
+.RS
The file
.I /etc/fstab
(see
.BR fstab (5)),
may contain lines describing what devices are usually
-mounted where, using which options. This file is used in three ways:
+mounted where, using which options.
.LP
-(i) The command
+The command
.RS
.br
.BI "mount \-a [\-t " type "] [\-O " optlist ]
option will make mount fork, so that the
filesystems are mounted simultaneously.
.LP
-(ii) When mounting a file system mentioned in
+When mounting a file system mentioned in
.IR fstab ,
it suffices to give only the device, or only the mount point.
-.LP
-(iii) Normally, only the superuser can mount file systems.
+
+
+The programs
+.B mount
+and
+.B umount
+maintain a list of currently mounted file systems in the file
+.IR /etc/mtab .
+If no arguments are given to
+.BR mount ,
+this list is printed.
+
+When the
+.I proc
+filesystem is mounted (say at
+.IR /proc ),
+the files
+.I /etc/mtab
+and
+.I /proc/mounts
+have very similar contents. The former has somewhat
+more information, such as the mount options used,
+but is not necessarily up-to-date (cf. the
+.B \-n
+option below). It is possible to replace
+.I /etc/mtab
+by a symbolic link to
+.IR /proc/mounts ,
+and especially when you have very large numbers of mounts
+things will be much faster with that symlink,
+but some information is lost that way, and in particular
+working with the loop device will be less convenient,
+and using the "user" option will fail.
+.RE
+
+.B The non-superuser mounts.
+.RS
+Normally, only the superuser can mount file systems.
However, when
.I fstab
contains the
.B group
option is similar, with the restriction that the user must be
member of the group of the special file.
-
-The programs
-.B mount
-and
-.B umount
-maintain a list of currently mounted file systems in the file
-.IR /etc/mtab .
-If no arguments are given to
-.BR mount ,
-this list is printed.
-
-When the
-.I proc
-filesystem is mounted (say at
-.IR /proc ),
-the files
-.I /etc/mtab
-and
-.I /proc/mounts
-have very similar contents. The former has somewhat
-more information, such as the mount options used,
-but is not necessarily up-to-date (cf. the
-.B \-n
-option below). It is possible to replace
-.I /etc/mtab
-by a symbolic link to
-.IR /proc/mounts ,
-and especially when you have very large numbers of mounts
-things will be much faster with that symlink,
-but some information is lost that way, and in particular
-working with the loop device will be less convenient,
-and using the "user" option will fail.
+.RE
.SH COMMAND LINE OPTIONS
The full set of mount options used by an invocation of