SysV Init
SysV Init (System V initialization) is a traditional Unix-based init system used to bootstrap the user space and manage system services during the boot process. It follows a sequential, runlevel-based approach where services are started or stopped in a predefined order based on scripts in directories like /etc/init.d. It was the standard init system for many Linux distributions before being largely replaced by more modern alternatives.
Developers should learn SysV Init when working with legacy systems, embedded devices, or older Linux distributions that still use it, as it's essential for system administration and service management in those environments. It's also useful for understanding the evolution of init systems and for maintaining compatibility with scripts written for traditional Unix-like systems, though for new projects, modern init systems are generally preferred.