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Man Pages
ZERO(4) FreeBSD Kernel Interfaces Manual ZERO(4)

zero
the zero device

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.

/dev/zero
 

full(4), null(4)

A zero device appeared in 4.4BSD.
April 7, 1996 FreeBSD 12.0-RELEASE

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