Linux User and user group management commands

Article Title: Linux User and user group management commands. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

Linux is a multi-user multi-task time-sharing operating system. any user who wants to use system resources must first apply for an account from the system administrator and then enter the system as the account. User Accounts can help system administrators track users who use the system and control their access to system resources. They can also help users organize files and provide security protection for users.

1. useradd

The useradd command creates a new user account. Its basic usage is

Useradd Username

Enter the following command

Useradd newuser

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The system will create a new user newuser whose Home directory is/home/newuser

The parameters of the useradd command are often combined

Useradd username-g group name? G group name-d Home directory name-p Password

-G specifies the Primary Group of the user.

-G: Specifies the secondary group of the user.

-D: Specifies the Home Directory of the user.

-P specifies the password of the user.

Enter the following command

Useradd oracle? G oinstall? G dba? D/home/oracle? P ora123

The system will create an oracle user whose primary group is oinstall and whose secondary group is dba.

The/Home/oracle password is ora123 in the home directory.

2. userdel

The userdel command is used to delete an existing account. Its usage is

Userdel Username

3. groupadd

The groupadd command creates a new user group. Its most basic usage is

Groupadd group name

Enter the following command

Groupadd newgroup

The system will create a new user group newgroup

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