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rsync(1) on macOS

The text d0ab76616c2d, as Mac OS X 10.3.5, Mac OS X 10.3.4, Mac OS X 10.3.3, Mac OS X 10.3.2, Mac OS X 10.3.1, Mac OS X 10.3 shipped it.

faster, flexible replacement for rcp

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rsync(1) on macOS now