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

NAME
     nnuullll - the null device

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

FILES
     /dev/null

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

BSD                              June 5, 1993                              BSD