1 .\" Copyright (c) 1993 Michael Haardt (u31b3hs@pool.informatik.rwth-aachen.de), Fri Apr 2 11:32:09 MET DST 1993
3 .\" This is free documentation; you can redistribute it and/or
4 .\" modify it under the terms of the GNU General Public License as
5 .\" published by the Free Software Foundation; either version 2 of
6 .\" the License, or (at your option) any later version.
8 .\" The GNU General Public License's references to "object code"
9 .\" and "executables" are to be interpreted as the output of any
10 .\" document formatting or typesetting system, including
11 .\" intermediate and printed output.
13 .\" This manual is distributed in the hope that it will be useful,
14 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
15 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 .\" GNU General Public License for more details.
18 .\" You should have received a copy of the GNU General Public
19 .\" License along with this manual; if not, write to the Free
20 .\" Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
23 .\" Modified Sat Jul 24 17:00:12 1993 by Rik Faith (faith@cs.unc.edu)
25 .TH NULL 4 "21. November 1992" "Linux" "Gerätedateien"
27 null, zero \- Daten-Vernichter
29 Daten welche an die Geräte
30 .BR null " oder " zero
31 gelangen, werden ungeachtet ihres Inhaltes, vernichtet.
33 Lesen aus der Gerätedatei
35 liefert immer ein Dateiende (EOF) zurück, während
37 immer das Zeichen \e0 zurück gibt.
39 .BR null " und " zero " werden generiert durch:"
42 mknod -m 666 /dev/null c 1 3
44 mknod -m 666 /dev/zero c 1 5
46 chown root.mem /dev/null /dev/zero
50 Ist das lesen und schreiben auf diesen Gerätedateien nicht für alle Benutzer
51 erlaubt, können diverse Programme sonderbar reagieren.