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NULL(4) Device Drivers Manual NULL(4)

null — the null device

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.

/dev/null
 

zero(4)

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

OpenBSD-6.2 May 31, 2007 NULL(4)