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mknod(8) [freebsd man page]

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 argu- ment. 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 6 AT&T UNIX. BSD
January 31, 2010 BSD

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mknod(8)						      System Manager's Manual							  mknod(8)

NAME
mknod - Creates a special file SYNOPSIS
/usr/sbin/mknod special_file [ b major_device# minor_device# | c major_device# minor_device#] /usr/sbin/mknod filename p DESCRIPTION
The mknod command makes a directory entry. The first argument is the name of the special device file. Select a name that is descriptive of the device. The mknod command has two forms. In the first form, the second argument is the b or c flag. The last two arguments are numbers specifying the major_device, which helps the operating system find the device driver code, and the minor_device, the unit drive, or line number, which may be either decimal or octal. The assignment of major device numbers is specific to each system. You can determine the device numbers by examining the conf.c system source file. If you change the contents of the conf.c file to add a device driver, you must rebuild the kernel. In the second form of mknod, you use the p flag to create named pipes (FIFOs). Only the superuser can create a character or device special file. FLAGS
Indicates that the special file corresponds to a block-oriented device (disk or tape) Indicates that the special file corresponds to a character-oriented device Creates named pipes (FIFOs) EXAMPLES
To create the special file for a new drive, /dev/disk/dsk20, with a major device number of 1 and a minor device number of 2, enter: mknod /dev/disk/dsk20 b 1 2 This command creates the special file, /dev/disk/dsk20, which is a block special file with major device number 1 and minor device number 2. To create a pipe named fifo, enter: mknod fifo p This command creates the pipe fifo, which is not necessarily in the current directory. FILES
Specifies the command path Specifies the system device numbers specification file delim off mknod(8)
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