Man

Command Section
NULL(4)                FreeBSD 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

SEE ALSO
     full(4), zero(4)

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

FreeBSD 11.1-RELEASE-p4          June 5, 1993          FreeBSD 11.1-RELEASE-p4
Command Section