Linux system startup steps

Linux startup steps:

1: First bios power-on self-test and initialization (this process will detect related hardware (cpu, memory, graphics card, hard disk, etc.))

2: Load the kernel and read the configuration file in /boot

3: Start the initialization process and start running/sbin/init

4 : Read /etc/initab to determine the run level

5: Load the boot program according to /etc/rc.d/rcN.d, rcN.d is Connection files ("N" here represents a number) all point to /etc/rc.d/init.d.

6: Run again/etc/rc.d/rc.local

7: For login (3 ways ssh, command line, graphical)

8: Enter loginshell, take the command line as an example, first read the global configuration file /etc/profile, and then read the home directory (home ) in ~/.bash_profile and ~/.bash_login and ~/.profile

Note: Linux The common "rc" is generally the abbreviation of "run command" and is commonly used in script file names.

Recommended tutorial: Linux tutorial

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