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Linux 2.6 - man page for null (linux section 4)

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NULL(4) 			    Linux Programmer's Manual				  NULL(4)

NAME
       null, zero - data sink

DESCRIPTION
       Data written to a null or zero special file is discarded.

       Reads  from  the  null  special	file always return end of file (i.e., read(2) returns 0),
       whereas reads from zero always return bytes containing zero (\0 characters).

       null and zero are typically created by:

	      mknod -m 666 /dev/null c 1 3
	      mknod -m 666 /dev/zero c 1 5
	      chown root:root /dev/null /dev/zero

FILES
       /dev/null
       /dev/zero

NOTES
       If these devices are not writable and readable for  all	users,	many  programs	will  act
       strangely.

SEE ALSO
       chown(1), mknod(1), full(4)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2009-02-23					  NULL(4)
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