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open(2) on macOS

The text c05546d357c9, as macOS 10.15.6, macOS 10.15.5, macOS 10.15.4, macOS 10.15.3, macOS 10.15.2, macOS 10.15.1, macOS 10.15 shipped it.

open or create a file for reading or writing

open(2) on macOS now