Manpage of NULL
NULLSection: Linux Programmer's Manual (4)
NAMEnull, zero - data sink
DESCRIPTIONData written to the /dev/nulland /dev/zerospecial files is discarded.
Reads from /dev/nullalways return end of file (i.e., read(2) returns 0), whereas reads from /dev/zeroalways return bytes containing zero (aq\0aq 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)
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