Introduction to user and group management commands in Linux

Introduction to user and group management commands in Linux

Configuration files for users and groups in Linux mainly include passwd, shadow, group, and gshadow. The passwd user saves the user's account information and is readable to any user; The shadow detachment root user is readable; the group is a means to control the permissions of user groups, this file can be read by any user. gshadow is used to define the user's group password and Group Administrator information.

Common User management commands:

Add the user's command: useradd-u UID-g group name-d/home/group name-s/bin/bsh-e 2011/1/1 (expiration time) User Name (zhang)

Command to delete a user: userdel-r username

Modify the attributes of a user's account: usermod-l newusername username change the existing user name

Lock the specified username: usermod-L username

Unlock the Locked User: usermod-U username

Change User Password: passwd Password

Passwd related operations

Passwd-S username is used to query the status of the specified user's password, only available to the root user

Passwd-l username: the user locks the specified user

Passwd-u username user to unlock the relevant user

Passwd-d username is used to delete the password of a specified user, which is only available to the root user.

Related Management commands for group accounts:

Groupadd-r group name

Groupdel-r group name

Groupmod-r group name (Change Group attributes)

Command for gpasswd: the user adds or deletes the specified user from the group.

Command Format: gpasswd [parameter] user name group name

Gpasswd-a username groupname adds the specified user to the specified user group.

Gpasswd-d username groupname: delete a specified user from the group

Gpasswd-A usernmae groupname: Specify the specified user as the Group Administrator.