Explanation
The first program the Linux kernel starts at boot time when using System V init is /sbin/init. System V init is a traditional init system that uses a series of shell scripts to initialize and manage the system services. The init program is the parent of all other processes and it is responsible for reading the /etc/inittab file and executing the appropriate scripts for each runlevel. The /sbin/init program is part of the 101.1 Determine and configure hardware settings topic of the LPI Linux Essentials certification program12. References:
* Linux Essentials - Linux Professional Institute Certification Programs1
* Exam 101 Objectives - Linux Professional Institute2
* A guide to System V Init3
* Linux Init Levels Explained: Init 0 - Init 64
* Init Systems Unveiled - Understanding the Differences Between Systemd and SystemV5