mknod

MKNOD(8)                   BSD System Manager's Manual                  MKNOD(8)

NAME
     mknod — build special file

SYNOPSIS
     mknod name
     mknod name [b | c] major minor [owner:group]

DESCRIPTION
     The mknod utility is deprecated on modern FreeBSD systems.

     The mknod utility creates device special files.  To make nodes manually,
     the arguments are:

     name    Device name, for example /dev/da0 for a SCSI disk or /dev/pts/0 for
             pseudo-terminals.

     b | c   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 c.

     major   The major device number is an integer number which tells the kernel
             which device driver entry point to use.

     minor   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.

     owner:group
             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
     strtoul(3), so that a leading ‘0x’ indicates a hexadecimal number, and a
     leading ‘0’ will cause the number to be interpreted as octal.

     The mknod utility can be used to recreate deleted device nodes under a
     devfs(5) mount point by invoking it with only a filename as an argument.
     Example:

           mknod /dev/cd0

     where /dev/cd0 is the name of the deleted device node.

COMPATIBILITY
     The chown(8)-like functionality is specific to FreeBSD.

     As of FreeBSD 4.0, block devices were deprecated in favour of character
     devices.  As of FreeBSD 5.0, device nodes are managed by the device file
     system devfs(5), making the mknod utility superfluous.  As of FreeBSD 6.0
     device nodes may be created in regular file systems but such nodes cannot
     be used to access devices.

SEE ALSO
     mkfifo(1), mknod(2), devfs(5), chown(8)

HISTORY
     A mknod utility appeared in Version 4 AT&T UNIX.

BSD                              October 3, 2016                             BSD