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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)						    BSD System Manager's Manual 						  MKNOD(8)

NAME
mknod -- make device special file SYNOPSIS
mknod [-F format] name [c | b] major minor mknod [-F format] name [c | b] major unit subunit mknod name [c | b] number mknod name w DESCRIPTION
The mknod command creates device special files. To make nodes manually, the required arguments are: name Device name, for example ``sd'' for a SCSI disk on an HP300 or a ``pty'' for pseudo-devices. b | c | w 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. Whiteout nodes are type w. 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 one of several similar devices the node corresponds to; for example, it may be a spe- cific serial port or pty. unit and subunit The unit and subunit numbers select a subset of a device; for example, the unit may specify a particular SCSI disk, and the subunit a partition on that disk. (Currently this form of specification is only supported by the bsdos format, for compatibility with the BSD/OS mknod(8).) Device numbers for different operating systems may be packed in a different format. To create device nodes that may be used by such an oper- ating system (e.g. in an exported file system used for netbooting), the -F option is used. The following formats are recognized: native, 386bsd, 4bsd, bsdos, freebsd, hpux, isc, linux, netbsd, osf1, sco, solaris, sunos, svr3, svr4 and ultrix. Alternatively, a single opaque device number may be specified. SEE ALSO
mkfifo(1), mkfifo(2), mknod(2) HISTORY
A mknod command appeared in Version 6 AT&T UNIX. The -F option appeared in NetBSD 1.4. NetBSD 1.4 September 11, 1998 NetBSD 1.4
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