How to make your Linux system omit the user name and password

It is difficult to enter the system by entering the user name and password when performing livecd. Therefore, we plan to skip these two steps.

 

1. Password verification omitted

 

Simply change root: X: 0: 0: Root:/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

 

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

 

The script actually executes the login of a root user. If you have other requirements, you can add them to the script.