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ssh-agent(1) on macOS

The text 25c31e90540c, as OS X 10.11.6, OS X 10.11.5, OS X 10.11.4, OS X 10.11.3, OS X 10.11.2, OS X 10.11.1, OS X 10.11 shipped it.

authentication agent

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ssh-agent(1) on macOS now