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FilledSmallSquareOpenWrite["file"] opens a file to write output to it, and returns an OutputStream object.

FilledSmallSquareOpenWrite deletes any existing contents in a file, and prepares to write output starting at the beginning of the file.

FilledSmallSquare For output to pipes, OpenWrite and OpenAppend are equivalent.

FilledSmallSquare See notes for OpenAppend.

FilledSmallSquare See The Mathematica Book: Section 2.11.3.