control.ctl(5) on Linux
The text 6c3a0a974f6d, as Debian 13 (Trixie), Debian 11 (Bullseye), Debian 8 (Jessie), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.
specify handling of Usenet control messages