NULL(4)                   (2015-07-23)                    NULL(4)

     NAME
          null, zero - data sink

     DESCRIPTION
          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 (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

     FILES
          /dev/null
          /dev/zero

     NOTES
          If these devices are not writable and readable for all
          users, many programs will act strangely.

          Since Linux 2.6.31, reads from /dev/zero are interruptible
          by signals.  (This change was made to help with bad laten-
          cies for large reads from /dev/zero.)

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

     COLOPHON
          This page is part of release 5.10 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 https://www.kernel.org/doc/man-pages/.

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