How to create a user and associate it to a group unix

1.-The first this is define a group where we need to have the group id and the name of the group

-bash-3.2# groupadd
usage: groupadd [-g gid]  group
-bash-3.2# groupadd -g 200 test
-bash-3.2# cat /etc/group | grep test
test::200:
-bash-3.2#

2.- Now we need to create the user and associate it to the group and the home directory

Create a home directory

-bash-3.2# mkdir -p /export/home/test

Change the permission for home user to user test and group test

-bash-3.2# useradd -u 200 -g 200  -d /export/home/test -c "test user" -s /bin/bash test

3.- Change the password

-bash-3.2# passwd test
New Password:
Re-enter new Password:
passwd: password successfully changed for test
-bash-3.2#

4.-Now you can check that user is available to login in the server

-bash-3.2# su - test
Oracle Corporation      SunOS 5.10      Generic Patch   January 2005
-bash-3.2$ pwd
/export/home/test
-bash-3.2$

 

5.-If you need to delete the user you have to form to do it

With -r option you Remove the user's home directory from  the  system, the home directory will no  longer  be accessible

-bash-3.2# userdel -r test

However if you need to store the home directory information you can use userdel without option

-bash-3.2# userdel test

6.-Delete the group

-bash-3.2# groupdel test

7.-Change the group to the user test to oracle group

-bash-3.2# id test
uid=200(test) gid=200(test)
-bash-3.2#
-bash-3.2# usermod -g oracle test
-bash-3.2# id test
uid=200(test) gid=100(oracle)