Unix/Linux Go Back    


NetBSD 6.1.5 - man page for mknod (netbsd section 8)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


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

NAME
     mknod -- make device special file

SYNOPSIS
     mknod [-rR] [-F fmt] [-g gid] [-m mode] [-u uid] name [c | b] [driver | major] minor
     mknod [-rR] [-F fmt] [-g gid] [-m mode] [-u uid] name [c | b] major unit subunit
     mknod [-rR] [-g gid] [-m mode] [-u uid] name [c | b] number
     mknod [-rR] [-g gid] [-m mode] [-u uid] name p
     mknod -l

DESCRIPTION
     The mknod command creates device special files, or fifos.	Normally the shell script
     /dev/MAKEDEV is used to create special files for commonly known devices; it executes mknod
     with the appropriate arguments and can make all the files required for the device.

     To make nodes manually, the arguments are:

     -r       Replace an existing file if its type is incorrect.

     -R       Replace an existing file if its type is incorrect.  Correct the mode, user and
	      group.

     -F fmt   Create device nodes that may be used by an operating system which uses device num-
	      bers packed in a different format than NetBSD uses.  This is necessary when NetBSD
	      is used as an NFS server for netbooted computers running other operating systems.

	      The following values for the fmt are recognized: native, 386bsd, 4bsd, bsdos,
	      freebsd, hpux, isc, linux, netbsd, osf1, sco, solaris, sunos, svr3, svr4, and
	      ultrix.

     -g gid   Specify the group for the device node.  The gid operand may be a numeric group ID
	      or a group name.	If a group name is also a numeric group ID, the operand is used
	      as a group name.	Precede a numeric group ID with a # to stop it being treated as a
	      name.

     -m mode  Specify the mode for the device node.  The mode may be absolute or symbolic, see
	      chmod(1).

     -u uid   Specify the user for the device node.  The uid operand may be 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.  Precede a numeric user ID with a # to stop it being treated as a name.

     name     Device name, for example ``sd'' for a SCSI disk on an HP300 or a ``pty'' for
	      pseudo-devices.

     b | c | p
	      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.
	      Specifying p creates fifo files.

     driver | major
	      The major device number is an integer number which tells the kernel which device
	      driver entry point to use.  If the device driver is configured into the current
	      kernel it may be specified by driver name or major number.  To find out which major
	      device number to use for a particular device, use mknod -l, check the file
	      /dev/MAKEDEV to see if the device is known, or check the system dependent device
	      configuration file:

		    ``/usr/src/sys/arch/<arch>/<arch>/conf.c''

	      (e.g.  /usr/src/sys/arch/vax/vax/conf.c).

     minor    The minor device number tells the kernel which one of several similar devices the
	      node corresponds to; for example, it may be a specific 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.  (Cur-
	      rently this form of specification is only supported by the bsdos format, for com-
	      patibility with the BSD/OS mknod).

     number   A single opaque device number.  Useful for netbooted computers which require device
	      numbers packed in a format that isn't supported by -F.

     -l       List the device drivers configured into the current kernel together with their
	      block and character major numbers.

SEE ALSO
     chmod(1), mkfifo(1), mkfifo(2), mknod(2), MAKEDEV(8)

HISTORY
     A mknod command appeared in Version 6 AT&T UNIX.  The -F option appeared in NetBSD 1.4.  The
     -g, -l, -m, -r, -R, and -u options, and the ability to specify a driver by name appeared in
     NetBSD 2.0.

BSD					  June 17, 2004 				      BSD
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 08:04 PM.