(where/etc/inittab is a very important document, worth scrutiny http://www.2cto.com/os/201108/98426.html)
The 446-byte content at the beginning is specified as "Master Boot Record" (MBR), followed by 4 16-byte "Disk partition Table" (DPT), and 2-byte end flag (55AA)
Http://www.ruanyifeng.com/blog/2013/08/linux_boot_process.html
http://chrinux.blog.51cto.com/6466723/1192004
Http://www.xshell.net/linux/inittab_rc.html
MBR: primary boot Record (master boot record, abbreviation: MBR), also known as the primary boot sector
Https://zh.wikipedia.org/wiki/%E4%B8%BB%E5%BC%95%E5%AF%BC%E8%AE%B0%E5%BD%95
Linux Kernel https://zh.wikipedia.org/wiki/Linux%E5%86%85%E6%A0%B8
"Kernel" refers to a system software that provides hardware abstraction layer, disk and file system control, multitasking and other functions.
To view Linux version information:
Http://www.360doc.com/content/12/0414/11/9171956_203493838.shtml
Fundamentals-Rules for naming Linux kernel version numbers
The role of the kernel: from the programmer's point of view, the operating system's kernel provides an extended or virtual computing platform equivalent to the computer hardware. It abstracts out a lot of hardware details, and the program can process data in a uniform way, while programmers can avoid many of the hardware details. From another perspective, the average user sees the operating system as a resource manager, with the help of which users can organize their data in a way that is easy to understand, complete their work, and share resources with others.
Linux supports multitasking in a unified manner, which is transparent to the user process, and each process runs as if it were only one process running on the computer, exclusive of memory and other hardware resources, and in fact, the kernel is running several processes concurrently, And it enables several processes to use the hardware resources fairly and reliably, and also to enable the processes to run independently of each other.
6 Modes of linux:init (there are actually 7 types)
startup process and system initialization of Linux system