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FreeBSD 11.0 - man page for null (freebsd section 4)

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
SEE ALSO
full(4), zero(4)
HISTORY
A null device appeared in Version 7 AT&T UNIX.
BSD
June 5, 1993 BSD

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