Booting process of Linux
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The Linux booting process involves multiple stages and is in many ways similar to the BSD and other Unix-style boot processes, from which it is derived. Although the Linux booting process depends very much on the computer architecture, those architectures share similar stages and software components, including system startup, bootloader execution, loading and startup of a Linux kernel image, and execution of various startup scripts and daemons. Those are grouped into 4 steps: system startup, bootloader stage, kernel stage, and init process.