LFCS Question #692: Real Exam Question with Answer & Explanation

Question

What is the first program that is usually started, at boot time, by the Linux kernel when using SysV init?

Options

• A/lib/init.so
• B/sbin/init
• C/etc/rc.d/rcinit
• D/proc/sys/kernel/init
• E/boot/init

Explanation

The Linux kernel, when utilizing the SysV init system, initiates the /sbin/init program as the first user-space process to manage system initialization and process supervision.

Common mistakes.

• A. /lib/init.so is a shared library, not an executable program, and therefore cannot be directly started as the initial system process.
• C. /etc/rc.d/rcinit (or similar rc scripts) are typically executed by init at various runlevels, not started directly by the kernel itself.
• D. /proc/sys/kernel/init is a kernel parameter file used for configuration, not an executable program that the kernel starts.
• E. /boot/init is not a standard path for the init executable; /sbin/init is the conventional and expected location for the System V init process.

Concept tested. SysV init system initialization process

Reference. https://man7.org/linux/man-pages/man8/init.8.html

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