null, zero - data sink
Data written to the /dev/null
special files is
Reads from /dev/null
always return end of file (i.e., read
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
If these devices are not writable and readable for all users, many programs will
Since Linux 2.6.31, reads from /dev/zero
are interruptible by signals.
(This change was made to help with bad latencies for large reads from