NULL(4) manual page
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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
/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)
This
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