Sixth chapter user account and group management

Sixth chapter user account and group management

Section I user classification

• Super User

  Root:x:0:0:root:/root:/bin/bash

  
  for user

  	x	0	0		/root
  user name is root	x means has password	user ID		Comment	user home directory	The first program executed after logging on to the system

• Normal User

  Thomas:x:1000:1000:thomas:/home/thomas:/bin/bash

  Thomas	X	1000	1000	Thomas	/home/thomas	/bin/bash
  User name For Thomas	X indicates Have a password	User ID	Group ID	With the user Related to Comments	User home Directory	After logging in to the system Implementation of the first A program

Section II User account creation and management

2. Create a user account

   Useradd user1

4. Create a user password

   passwd user1

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6. View user Information

   ID User1

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8. View files for user information

   cat/etc/passwd

10. View files that hold user password information

    Cat/etc/shadow

11. Delete a user account

    Userdel user1 the deletion will only User1 from /etc/passwd The configuration file is deleted,

    and User1 directory is not deleted, the directory remains in the /Home directory.

    Userdel-r user1

    The /etc/passwd configuration file is deleted, and the /home/user1 directory is deleted.
    

    
    

13. Create a virtual user account

    A virtual user account that can only access a specific directory without the permission to log on to the system.

    vim/etc/passwd
    

    opens the/etc/passwd file, finds the User1:x:1001:1001::/home/user1:/bin/bash line,

    after entering insert mode , change its/bin/bash to /sbin/nologin, and then save to exit.

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Section III User group creation and management

2. create user group

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4. create user group password

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6. View User group information

   Cat/etc/group

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8. View security group account information

   Cat/etc/gshadow

10. Modify Group Name

    Groupmod-n test public will change the public group name to test

12. Delete a group

    GROUPDESL Test

Section Fourth user accounts and group management

2. User account added to group

   Gpasswd-a User1 public Add user account User1 to the public group

4. Delete User in Group

   gpasswd-d user1 public to remove user account User1 from the public group

6. You can add user accounts directly to a group when creating a user account, provided that the group first creates a good

   Useradd-g Shanghai User1 create User1 and add User1 to Shanghai Group

8. Add user accounts to multiple groups at the same time

   Useradd-g shanghai,beijing User2 will user2 account added to Shanghai and Beijing two groups at the same time

Sixth chapter user account and group management