null, zero - data sink
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
If these devices are not writable and readable for all users, many
programs will act strangely.
chown(1), mknod(1), full(4)
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be found at http://www.kernel.org/doc/man-pages/.