null(4) - phpMan

NULL(4)                             Linux Programmer's Manual                             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 ('\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

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 latencies 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/.

Linux                                       2015-07-23                                    NULL(4)

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