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

To Add a group: groupadd Group name

To 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  //view Likui belongs to which group  -a sorry Bob        //Add Likui to the 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------. -Sorry sorry4096June A  -: -likuidrwx------.3Tom Tom +June A  -: -Tom[[email protected] sorry]# groupadd BOB//Create a Bob group[Email protected] sorry]# gpasswd-a Sorry BOB//give Bob's permission to sorry users[Email protected] sorry]# gpasswd-a Tom BOB//under the sorry user, add Tom to the Bob GroupAdding user Tom to group BOB//the display is added in[email protected] sorry]# groups Tom//See which groups Tom users belong totom:tom bob[[email protected] sorry]# gpasswd-D Tom BOB//Delete Tom from the Bob Group under the sorry userremoving user Tom fromgroup 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);

switching of effective groups : 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