How to add a user in linux and grant root permissions

How to add a user and grant root permissions in Linux?

How to add a user under Linux and grant root permissions:

1. To add a user, first use the adduser command to add an ordinary user, the command As follows:

#adduser tommy
//添加一个名为tommy的用户
#passwd tommy   //修改密码
Changing password for user tommy.
New UNIX password:     //在这里输入新密码
Retype new UNIX password:  //再次输入新密码
passwd: all authentication tokens updated successfully.

2. Grant root permissions

Method 1:Modify the /etc/sudoers file, find the following line, and change Remove the previous comment (#)

## Allows people in group wheel to run all commands
%wheel    ALL=(ALL)    ALL

and then modify the user so that it belongs to the root group (wheel). The command is as follows:

#usermod -g root tommy

After the modification, you can now log in with the tommy account, and then use the command su – , you can obtain root permissions to operate.

Method 2: Modify the /etc/sudoers file, find the following line, and add a line under root, as shown below:

## Allow root to run any commands anywhere
root    ALL=(ALL)     ALL
tommy   ALL=(ALL)     ALL

After the modification, you can now use tommy Log in with your account, and then use the command sudo - to obtain root permissions to operate.

Method 3: Modify the /etc/passwd file, find the following line, and change the user ID to 0, as shown below:

tommy:x:0:33:tommy:/data/webroot:/bin/bash

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