How to omit a password in Linux

Article Title: Teach you how to omit a password in Linux. Linux is a technology channel of the IT lab in China. Some basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open-source systems, such as Linux, which omit passwords, are absolutely not recommended, but cannot be completed, linux skips the password, which poses a great threat to system security. Beginners can try this method on their own test machines. It helps beginners better understand the Linux system.
　 1. Password verification omitted
Simply change root: x: 0: 0: root:/bin/bash in/etc/passwd to root: 0: 0: root:/root: /bin/bash, you can remove the x in it, so that the root user does not need a password. The same applies to other users.
　　 2. the user name is omitted.
(1) Modify/etc/inittab
The following configurations are available in inittab:
1: 2345: respawn:/sbin/agetty tty1 9600
2: 2345: respawn:/sbin/agetty tty2 9600
3: 2345: respawn:/sbin/agetty tty3 9600
4: 2345: respawn:/sbin/agetty tty4 9600
5: 2345: respawn:/sbin/agetty tty5 9600
6: 2345: respawn:/sbin/agetty tty6 9600
Indicates that the system can have six consoles, and ALT + (F1 ~ F6. While/sbin/agetty is a login verification program. When it is executed, the user is prompted to enter the user name and password, and then start a specified shell (specified in the passwd file ).
Therefore, we only need to modify it to not execute agettty, but to execute a script compiled by ourselves, we can skip the user name and password input. Modify as follows:
1: 2345: respawn:/root/logintest tty1 9600 (graphic interface is 5, to be tested)
Here I place a test script in/root/, so that the script will be executed when the system starts. The script content:
#! /Bin/sh
/Bin/login-f root (set as executable, to be tested)
The script actually executes the login of a root user. If you have other requirements, you can add them to the script.
In this way, we have completed some lazy operations to make Linux omit password input.