Filter: [orig. {{UNIX}}, Now Also In {{MS-DOS}}] N.

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:filter: [orig. {{UNIX}}, now also in {{MS-DOS}}] n. A program that
processes an input data stream into an output data stream in some
well-defined way, and does no I/O to anywhere else except possibly
on error conditions; one designed to be used as a stage in a
`pipeline' (see {plumbing}). Compare {sponge}.
-- The AI Hackers Dictionary

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