null(4) opendarwin man page | unix.com

NULL(4) 						   BSD Kernel Interfaces Manual 						   NULL(4)

NAME
     null -- the null device

DESCRIPTION
     The null device accepts and reads data as any ordinary (and willing) file - but throws it away. The length of the null device is always zero.

FILES
     /dev/null

HISTORY
     A null device appeared in Version 7 AT&T UNIX.

BSD
								   June 5, 1993 							       BSD