With Margo Linux (Lesson 1)

Summary of simple User management commands

One, user-related commands

1.useradd

Man Document Description: Create a new user or update default new user information

英文说明: Create a new user or update the default new user information

Reusing parameters:

-D,--home home_dir: Create home directory

-C,--comment comment Create comment description

-D,--defaults modify the user default value parameter

-G,--gid Group specifies basic groups

-G,--groups group1[,group2,... [, GROUPN]] Specify a secondary group, multiple groups can be separated by commas to add

-S,--shell shell specifies the default shell

-U,--uid uid Specify user uid

Example: Create a new user Tom Comment is: Tomcat, additional group is cat, default shell is/sbin/nologin

Groupadd Cat; Useradd-c "Tomcat"-G cat-s/sbin/nologin Tom

2.userdel

Man Document Description: Delete a user account and related files

英文说明: Delete user account and related files

Important Parameters:

-F,--force forcibly delete the user, even if the user is still logged in

-R,--remove delete users and their home directories and mail buffer pools

Example: Delete a Tom and its related files

Userdel-r Tom

3.usermod

Man Document Description: Modify a user account

英文说明: Modify a currently existing account, the basic parameters and Useradd are consistent

Important Parameters:

-A,--append is used with the-G parameter to add a user to multiple additional groups

-L,--lock lock an account

-u,--unlock Unlocking an account

Example: Modifying a Tom User's shell to/bin/bash and adding it to the dog group

Usermod-a-G dog-s/bin/bash Tom

Second, the group of related orders

1.groupadd

Man Document Description: Create a new group

英文说明: Create a new group

Important Parameters:

-G,--gid GID specify group ID

-p,--password password specifying a group password allows users to join with the NEWGRP command

Example: Create a new group named Dog with a group password of dog123

Groupadd-p ' dog123 ' dog

2.groupdel

Man Description: Delete a group

英文说明: Delete a group

Example:

Groupdel Dog

3.groupmod

Man Description: Modify a group definition on the system

英文说明: Modify a group that already exists in a system

-G,--gid GID modified GID

-P,--password password modify group password

Example:

Modify the dog group password to dog456

Groupmod-p ' dog456 ' dog

Third, password modification

passwd

Man Description: Update user ' s authentication tokens

英文说明: Modify the user authentication token

Important Parameters:

-U Lock user

-L Unlock User

--stdin Modifying a user's password in a pipe format

Example: Modify a Tom user password by using the--stdin method

Echo ' AAABBBCCC ' |passwd--stdin Tom

With Margo Linux (Lesson 1)