explain about the initial process sequence while the system boots up?

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explain about the initial process sequence while the system boots up?..

Answer / Rishi Kant Pal

The initial process sequence during a Unix system bootup involves several key steps:

1. Power-On Self Test (POST): The system performs basic tests on hardware components to ensure they are functioning properly.
2. Bootloader (usually GRUB) Initialization: The bootloader loads the operating system's kernel image from the storage device into memory.
3. Kernel Initialization: The Linux kernel initializes critical hardware, such as memory management and devices, creates essential data structures, and sets up various system calls.
4. System Call Initiation: System processes like sysinit and kerneld are started by the kernel during initialization. These services help set up userspace components and further initialize the system.
5. Mount Root File System: The kernel mounts the root file system (often /dev/root) to enable access to important files needed for further bootup operations.
6. User-space Initialization: Init processes are started, which perform tasks like setting up network connections, configuring hardware, and creating necessary devices.
7. Login Shell: The final step in the boot process is the login shell, where users interact with the system.

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