build special file
mknod utility is
deprecated on modern FreeBSD systems.
utility creates device special
files. To make nodes manually, the arguments are:
- Device name, for example /dev/da0 for a
SCSI disk or /dev/pts/0 for
- Type of device. If the device is a block type device such as a tape or
disk drive which needs both cooked and raw special files, the type is
b. All other devices are character type
devices, such as terminal and pseudo devices, and are type
- The major device number is an integer number which tells the kernel which
device driver entry point to use.
- The minor device number tells the kernel which subunit the node
corresponds to on the device; for example, a subunit may be a file system
partition or a tty line.
- The owner
group operand pair is optional, however,
if one is specified, they both must be specified. The
owner may be either a numeric user ID or
a user name. If a user name is also a numeric user ID, the operand is used
as a user name. The group may be either a
numeric group ID or a group name. Similar to the user name, if a group
name is also a numeric group ID, the operand is used as a group name.
Major and minor device numbers can be given in any format acceptable to
so that a leading ‘
’ indicates a
hexadecimal number, and a leading ‘
will cause the number to be interpreted as octal.
utility can be used to recreate
deleted device nodes under a
mount point by invoking it with only a filename as an argument. Example:
is the name of the deleted
functionality is specific to FreeBSD
As of FreeBSD 4.0
, block devices were deprecated in
favour of character devices. As of FreeBSD 5.0
nodes are managed by the device file system
utility superfluous. As of
device nodes may be created in regular
file systems but such nodes cannot be used to access devices.
utility appeared in
Version 4 AT&T UNIX