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. 69To learn what 70major device number to use for a particular device, check 71.Pa /usr/src/sys/conf/majors . 72.It Ar minor 73The minor device number tells the kernel which subunit 74the node corresponds to on the device; for example, 75a subunit may be a file system partition 76or a tty line. 77.It Ar owner : Ns Ar group 78The 79.Ar owner 80.Ar group 81operand pair is optional, however, if one is specified, they both must be 82specified. 83The 84.Ar owner 85may be either a numeric user ID or a user name. 86If a user name is also a numeric user ID, the operand is used as a 87user name. 88The 89.Ar group 90may be either a numeric group ID or a group name. 91Similar to the user name, 92if a group name is also a numeric group ID, the operand is used as a 93group name. 94.El 95.Pp 96Major and minor device numbers can be given in any format acceptable to 97.Xr strtoul 3 , 98so that a leading 99.Ql 0x 100indicates a hexadecimal number, and a leading 101.Ql 0 102will cause the number to be interpreted as octal. 103.Pp 104The 105.Nm 106utility can be used to recreate deleted device nodes under a 107.Xr devfs 5 108mount point by invoking it using dummy arguments. 109Example: 110.Pp 111.Dl "mknod cd0 c 0 0" 112.Pp 113where 114.Dq Li cd0 115is the name of the deleted device node. 116.Sh COMPATIBILITY 117The 118.Xr chown 8 Ns - Ns 119like functionality is specific to 120.Fx . 121.Sh SEE ALSO 122.Xr mkfifo 1 , 123.Xr mknod 2 , 124.Xr chown 8 125.Sh HISTORY 126A 127.Nm 128utility appeared in 129.At v6 . 130