group(5) on OpenBSD
The text 76f689d407e0, as OpenBSD 3.3, OpenBSD 3.2, OpenBSD 3.1, OpenBSD 3.0, OpenBSD 2.9, OpenBSD 2.8 shipped it.
format of the group permissions file
The text 76f689d407e0, as OpenBSD 3.3, OpenBSD 3.2, OpenBSD 3.1, OpenBSD 3.0, OpenBSD 2.9, OpenBSD 2.8 shipped it.
format of the group permissions file