User & Group Management Concept in Linux

User and Group Management:-

User Management :

1. To Create User Account:-
   #Useradd Nilesh
   where, Nilesh = Username

   

   Note:- If you want to create a user as a normal user then you have to follow the below command. So Basically this will create Nilesh folder in the home directory.
   #sudo useradd -m Nilesh

   

2. To Create user account password:-

   #passswd Nilesh

   For switch user account:-

   #su - Nilesh

   For Logout from user account:-

   #exit
   or
   Press "Ctrl+d" key

   To delete user account:-

   #userdel Nilesh

   Note:- A normal user can not create another user without the help of sudo.

   

   Group Management:

   A group is a collection of user accounts that is very useful to administrators for managing and applying permission for several users.

3. To add group account:-

   #groupadd devopsgrp

   

   To find groups present on the system:-

   #cat /etc/group

   

   If you want to find out the last three groups:-

   #tail -3 /etc/group

   

   To check group account property:-

   #grep devopsgrp /etc/group

   

   To check group admin property:-
   #grep devopsgrp /etc/gshadow

   

   For Delete group account:-

   #groupdel devopsgrp

   Note:

   If you want to add a single member to a group:- To add a member in a group that member must be present in your system, if the member is not created or not present in the system you are not able to add it into the group.

   

   For adding a single member to group:-

   #gpasswd -a ravina devopsgrp

   

   For adding multiple members to group:-
   #gpasswd -M ravina,priti,suman devopsgrp

   

   To remove group member:-

   #gpasswd -d suman devopsgrp

   

   To make group admin:-
   #gpasswd -A ravina devopsgrp