ssh_config(5) on macOS

The text 17f834da1352, 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.

OpenSSH SSH client configuration files

ssh_config(5) on macOS now