NULLSection: Linux Programmer's Manual (4)
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NAMEnull, zero - data sink
DESCRIPTIONData written to the /dev/null and /dev/zero special files is discarded.
Reads from /dev/null always return end of file (i.e., read(2) returns 0), whereas reads from /dev/zero always return bytes containing zero ('\0' characters).
These devices 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 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
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