Systemd
Systemd is a system and service manager for Linux operating systems, designed as a replacement for traditional init systems like SysVinit. It provides a suite of tools for managing system processes, services, and resources, including parallel startup, on-demand service activation, and dependency tracking. It also handles logging, device management, and network configuration through integrated components like journald and networkd.
Developers should learn Systemd because it is the default init system in most modern Linux distributions (e.g., Ubuntu, Fedora, Debian), making it essential for system administration, service deployment, and troubleshooting. It is particularly useful for managing daemons, automating service restarts, and configuring system resources in production environments, such as web servers or containerized applications.