NAME
mmoouunntt - mount file systems
SYNOPSIS
mmoouunntt [-aaddffrruuvvww] [-tt ufs | lfs | externaltype]
mmoouunntt [-ddffrruuvvww] special | node
mmoouunntt [-ddffrruuvvww] [-oo options] [-tt ufs | lfs | externaltype] special node
DESCRIPTION
The mmoouunntt command calls the mount(2) system call to prepare and graft a
special device or the remote node (rhost:path) 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 mmoouunntt,, this list is printed. The options are as follows:-aa All the filesystems described in fstab(5) are mounted. Excep-
tions are those marked as ``noauto'' or are excluded by the -tt
flag (see below).-dd Causes everything to be done except for the actual system call.
This option is useful in conjunction with the -vv flag to deter-
mine what the mmoouunntt command is trying to do.-ff Forces the revocation of write access when trying to downgrade a
filesystem mount status from read-write to read-only.
-oo Options are specified with a -oo flag followed by a comma sepa-
rated string of options. The following options are available: async All I/O to the file system should be done asynchronously. This can be somewhat dangerous with respect to losing data when faced with system crashes and power outages. This is also the default. It can be avoided with the noasync option.force The same as -ff; forces the revocation of write access
when trying to downgrade a filesystem mount status from
read-write to read-only.
noasync This filesystem should not force all I/O to be written asynchronously.noauto This filesystem should be skipped when mount is run with
the -aa flag.
nodev Do not interpret character or block special devices on the file system. This option is useful for a server thathas file systems containing special devices for architec-
tures other than its own.noexec Do not allow execution of any binaries on the mounted
file system. This option 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.rdonly The same as -rr; mount the file system read-only (even the
super-user may not write it).
sync All I/O to the file system should be done synchronously.update The same as -uu; indicate that the status of an already
mounted file system should be changed.
union Causes the namespace at the mount point to appear as the
union of the mounted filesystem root and the existing
directory. Lookups will be done in the mounted filesys-
tem first. If those operations fail due to a non-exis-
tent file the underlying directory is then accessed. Allcreates are done in the mounted filesystem.
Any additional options specific to a filesystem type that is notone of the internally known types (see the -tt option) may be
passed as a comma separated list; these options are distinguishedby a leading ``-'' (dash). Options that take a value are speci-
fied using the syntax -option=value. For example, the mount com-
mand:mount -t hfs -o nosuid,-w,-m=755 /dev/disk2s9 /tmp
causes mmoouunntt to execute the equivalent of:/sbin/mounthfs -o nosuid -w -m 755 /dev/disk2s9 /tmp
-rr The file system is to be mounted read-only. Mount the file sys-
tem read-only (even the super-user may not write it). The same
as the ``rdonly'' argument to the -oo option.
-tt ufs | lfs | external type
The argument following the -tt is used to indicate the file system
type. The type ufs is the default. The -t option can be used to
indicate that the actions should only be taken on filesystems of the specified type. More than one type may be specified in acomma separated list. The list of filesystem types can be pre-
fixed with ``no'' to specify the filesystem types for which action should not be taken. For example, the mmoouunntt command:mount -a -t nonfs,hfs
mounts all filesystems except those of type NFS and HFS.
If the type is not one of the internally known types, mount will
attempt to execute a program in /sbin/mountXXX where XXX is
replaced by the type name. For example, nfs filesystems aremounted by the program /sbin/mountnfs.
-uu The -uu flag indicates that the status of an already mounted file
system should be changed. Any of the options discussed above(the -oo option) may be changed; also a file system can be changed
from read-only to read-write or vice versa. An attempt to change
from read-write to read-only will fail if any files on the
filesystem are currently open for writing unless the -ff flag is
also specified. 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 -oo argument, and
finally applying the -rr or -ww option.
-vv Verbose mode.
-ww The file system object is to be read and write.
The options specific to NFS filesystems are described in themountnfs(8) manual page.
FILES /etc/fstab file system tableSEE ALSO
mount(2), fstab(5), mountafp(8), mountcd9660(8), mountcddafs(8),
mountdevfs(8), mountfdesc(8), mounthfs(8), mountmsdos(8),
mountnfs(8), mountsmbfs(8), mountsynthfs(8), mountudf(8),
mountvolfs(8), mountwebdav(8), umount(8)
BUGS
It is possible for a corrupted file system to cause a crash. HISTORY A mmoouunntt command appeared in Version 6 AT&T UNIX. 4th Berkeley Distribution June 16, 1994 4th Berkeley Distribution