When the kernel finishes its core setup and hands control over to userland,
init(8) runs the shell script /etc/rc. This script handles all system setup, including mounting filesystems, configuring device nodes, identifying shared libraries, and any other task required to make the system usable. Some tasks are delegated to separate scripts; for example, /etc/netstart is used to configure the network.
In this section, we’ll cover how /etc/rc and other startup scripts function, and the flow of the startup process. Armed with this understanding, you should be able to easily configure your OpenBSD machine to start exactly what you need—no more, no less.
The startup system includes the scripts /etc/rc