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
If these devices are not writable and readable for all users, many programs will act strangely.
This page is part of release 3.33 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at http://man7.org/linux/man-pages/.
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Copyright (c) 1993 Michael Haardt (michaelmoria.de), Fri Apr 2 11:32:09 MET DST 1993 This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. Modified Sat Jul 24 17:00:12 1993 by Rik Faith (faithcs.unc.edu) |