null man page on Archlinux

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

       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  con‐
       taining 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 pro‐
       grams will act strangely.

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

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2009-02-23			       NULL(4)

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