freebsd man page for zero

ZERO(4) 						   BSD Kernel Interfaces Manual 						   ZERO(4)

NAME
     zero -- the zero device

DESCRIPTION
     The zero device accepts and reads data as any ordinary (and willing) file, but throws away any data written to it, and returns an endless
     supply of null bytes when read.

FILES
     /dev/zero

SEE ALSO
     full(4), null(4)

HISTORY
     A zero device appeared in 4.4BSD.

BSD
								   April 7, 1996							       BSD