This wiki page is about a path or a file in the Linux file system. Be bold and improve it! Describe its purpose and its use, which program created it and uses it, which configuration settings it might be dependent on, and which Linux distributions typically have this file by default while others might not.
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/etc/inittab is used by init. Depending on how the system is configured, it then delegates to OpenRC to start services defined by it. See http://linux.overshoot.tv/etc/runlevels .