1. Add a user, the command is as follows:
adduser zhangsan
2. To modify the user password, the command is as follows:
passwd zhangsan
The result after execution is as follows:
Changing password for user zhangsan
New password:
Enter the new password here and press Enter to confirm
Retype new password:
Enter the new password again, and then press Enter to confirm, the result after execution is as follows:
passwd: all authentication tokens updated successfully.
3. Give the newly added account root privileges
a). Modify the /etc/passwd file and change the user ID to 0. The command is as follows:
vi /etc/passwd
Find the line like this:
zhangsan:x:500:500:zhangsan:/home/tommy:/bin/bash
Modified as follows
zhangsan:x:0:500:tommy:/home/zhangsan:/bin/bash
keep
:wq
After logging in with the [zhangsan] account, you will directly obtain the permissions of the root account.
b). Modify the /etc/sudoers file with the following commands:
vi /etc/sudoers
Find the following line and add a line below root like this:
#Allow root to run any commands anywhere
root ALL=(ALL) ALL
Add a line:
zhangsan ALL=(ALL) ALL
keep
:wq
If prompted for a read-only file (as shown below)
E45: 'readonly' option is set (add ! to override)
perform a forced save
:wq!
After the modification is completed, you can now log in with the [zhangsan] account, and then use the command su - to obtain root privileges to operate.