Manual Section... (4) - page: null
NAMEnull, zero - data sink
DESCRIPTIONData 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
NOTESIf these devices are not writable and readable for all users, many programs will act strangely.
SEE ALSOchown(1), mknod(1), full(4)
COLOPHONThis page is part of release 3.21 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/.
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Time: 15:27:43 GMT, June 11, 2010