How to delete users and user groups in centos system

How to permanently delete users and user groups

Execute the following commands in sequence:

(Recommended tutorial: centos usage tutorial )

userdel testuser 
groupdel testgroup 
usermod –G testgroup testuser //（强制删除该用户的主目录和主目录下的所有文件和子目录）

Recommended related video tutorials: linux video tutorial

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