Performs normal startup initialization.
rc
The rc command has an entry in the /etc/inittab file. The init command creates a process for the rc command entry in the /etc/inittab file. The rc command performs normal startup initialization for the system. The contents of /etc/rc are installation specific. If all of the necessary operations complete successfully, the file exits with a zero return code that allows the init command to start loggers to complete normal initialization and startup.
The fsck command, init command, mount command.