Data 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


       If these devices are not writable and readable for all users, many pro-
       grams will act strangely.

       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

       chown(1), mknod(1), full(4)

       This 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

Linux                             2015-07-23                           NULL(4)
Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2019 Hurricane Electric. All Rights Reserved.