linux bootup sequence

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linux bootup sequence
1 bios, executes mbr where bootloader sits
2 mbr reads kernel into memory
3 grub (grund unified bootloader) kernel starts Init process.
4 kernel executes the /sbin/init program. init reads inittab, executes rc.sysinit
5 init - the rc script then starts services to reach the default run level
6 run level programs - these programs are executed from /etc/rc.d/rc*.dl
lilo linux. boot loader

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