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null.4

NULL

Section: Linux Programmer's Manual (4)
Updated: 2009-02-23
Index Return to Main Contents
 

NAME

null, zero - data sink  

DESCRIPTION

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

 

FILES

/dev/null
/dev/zero  

NOTES

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

SEE ALSO

chown(1), mknod(1), full(4)  

COLOPHON

This page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
DESCRIPTION
FILES
NOTES
SEE ALSO
COLOPHON

 

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