Explain system bootup in UNIX.

1.	Explain system bootup in UNIX.
Answer» It is the first THING when the system starts. It has majorly 5 phases Hardware - BIOS fired up and checks for the hardware connection Operating System LOADER - The OS loader is located in the initial 512-byte block of the boot device known as the MBR Kernel - It initializes various components of the computer, operating system and each PORTION of software responsible for task, usually consider a driver root user-space process (init and inittab) - This defines what should be run when the /sbin/init program is instructed to enter a particular run-level, giving the administrator an easy way to establish an environment for some usage Boot scripts - For each managed service (mail, nfs server, cron, ETC.), there is a single startup script located in a specific directory.

Answer»

It is the first THING when the system starts. It has majorly 5 phases

Hardware - BIOS fired up and checks for the hardware connection
Operating System LOADER - The OS loader is located in the initial 512-byte block of the boot device known as the MBR
Kernel - It initializes various components of the computer, operating system and each PORTION of software responsible for task, usually consider a driver
root user-space process (init and inittab) - This defines what should be run when the /sbin/init program is instructed to enter a particular run-level, giving the administrator an easy way to establish an environment for some usage
Boot scripts - For each managed service (mail, nfs server, cron, ETC.), there is a single startup script located in a specific directory.

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