Linux Account Management Chapter II: Management of user groups

1. Viewing the user's effective group

　　　　Groups user Name

Note: There may be multiple results from the view; The first is the primary group, followed by the sub-group

　　

2. Adding and removing groups

Adding a group: Groupadd Group name

Delete a group: Groupdel Group name　　

To add a user to a group: GPASSWD-A user 1

Create a Bob group Groupadd Bob

Add user 1 to the Bob Group gpasswd-a user 1 Bob

Parameters:-A add

-D Delete

-a set a user as the administrator of the group

For example1:(add user to a group)

[[email protected] sorry]# groupadd BOB  //Create a group [[email protected] sorry]# groups sorry  //See what Likui belongs to Group Sorry:sorry[[email protected] sorry]# gpasswd-a sorry Bob        //Add Likui to Bob Group  　　　　

For example2: ( set a user as the administrator of a group )

[[email protected] sorry]# useradd Tom                 //Create a Tom user [[email protected] sorry]# ll/home/total4drwx------. Orry Sorry   4096 June 20:14 likuidrwx------.  3 Tom   Tom   June 20:27 Tom[[email protected] sorry]# groupadd Bob           //Create a Bob Group [email protected] sorry]# gpasswd-a Sorry Bob       //Give Bob's permission to sorry user [[email protected] sorry]# gpasswd-a Tom BOB         //Under sorry user, Add Tom to the Bob Group adding user Tom to group BOB                       //display added [Root[email protected] sorry]# groups Tom                 //See which groups Tom users belong to C15>tom:tom Bob[[email protected] sorry]# gpasswd-d Tom Bob         //Under Sorry users, remove Tom from the BOB group removing user Tom from Group Bob[[email protected] sorry]#     

3, effective group of switching

　　　Newgrp

　　　　　If a user's effective group has multiple: Group 1; Group 2 ..... (The default group 1 is the main group, the other group is the sub-group);

Active Group switching: NEWGRP Group 2 user name

After switching, the user's valid group is: Group 2: Group 1 ...

　　　

Linux Account Management Chapter II: Management of user groups