1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)mknod.8 8.2 (Berkeley) 12/11/93 29.\" $FreeBSD$ 30.\" 31.Dd December 29, 2003 32.Dt MKNOD 8 33.Os 34.Sh NAME 35.Nm mknod 36.Nd build special file 37.Sh SYNOPSIS 38.Nm 39.Ar name 40.Op Cm c | Cm b 41.Ar major minor 42.Op Ar owner : Ns Ar group 43.Sh DESCRIPTION 44The 45.Nm 46utility creates device special files. 47To make nodes manually, the four required arguments are: 48.Pp 49.Bl -tag -width indent 50.It Ar name 51Device name, for example 52.Dq sd 53for a SCSI disk on an HP300 or a 54.Dq pty 55for pseudo-terminals. 56.It Cm b | Cm c 57Type of device. 58If the 59device is a block type device such as a tape or disk drive which needs 60both cooked and raw special files, 61the type is 62.Cm b . 63All other devices are character type devices, such as terminal 64and pseudo devices, and are type 65.Cm c . 66.It Ar major 67The major device number is an integer number which tells the kernel 68which device driver entry point to use. To learn what 69major device number to use for a particular device, check 70.Pa /usr/src/sys/conf/majors . 71.It Ar minor 72The minor device number tells the kernel which subunit 73the node corresponds to on the device; for example, 74a subunit may be a file system partition 75or a tty line. 76.It Ar owner : Ns Ar group 77The 78.Ar owner 79.Ar group 80operand pair is optional, however, if one is specified, they both must be 81specified. 82The 83.Ar owner 84may be either a numeric user ID or a user name. 85If a user name is also a numeric user ID, the operand is used as a 86user name. 87The 88.Ar group 89may be either a numeric group ID or a group name. 90Similar to the user name, 91if a group name is also a numeric group ID, the operand is used as a 92group name. 93.El 94.Pp 95Major and minor device numbers can be given in any format acceptable to 96.Xr strtoul 3 , 97so that a leading 98.Ql 0x 99indicates a hexadecimal number, and a leading 100.Ql 0 101will cause the number to be interpreted as octal. 102.Pp 103The 104.Nm 105utility can be used to recreate deleted device nodes under a 106.Xr devfs 5 107mount point by invoking it using dummy arguments. 108Example: 109.Pp 110.Dl "mknod cd0 c 0 0" 111.Pp 112where 113.Dq Li cd0 114is the name of the deleted device node. 115.Sh COMPATIBILITY 116The 117.Xr chown 8 Ns - Ns 118like functionality is specific to 119.Fx . 120.Sh SEE ALSO 121.Xr mkfifo 1 , 122.Xr mknod 2 , 123.Xr chown 8 124.Sh HISTORY 125A 126.Nm 127utility appeared in 128.At v6 . 129