User and Group management command

• Create a new user account

[root@daddylinux~]# useradd uddika

[root@daddylinux~]# passwd uddika

Changing password for user uddika.

New UNIX password: ******

Retype new UNIX password: *****

passwd: all authentication tokens updated successfully.

• Multisession Login(Users can login same time)

Alt+F2

Then give a username and password

Count the login users

[root@daddylinux~]# who

• Changing your own password as a normal user

Login the account

[uddika@daddylinux~]$ passwd

Changing password for user uddika.
Changing password for uddika.
(current) UNIX password: ******
New UNIX password: *******
Retype new UNIX password: *******
passwd: all authentication tokens updated successfully.

• How to change the password properties of a user

View the current password properties

[uddika@daddylinux~]$ chage -l uddika

Change the current password properties

[root@daddylinux~]# chage uddika

• The things that happened automatically once you create a user account

Every user will get a private home folder

[root@daddylinux~]# ls -l /home

Every user will get a private group account

Username = Uddika Private Group name = Uddika

Every user will get a user id (uid) and group id (gid)

[root@daddylinux~]# id Uddika

The user account database and the group account database will be automatically updated

• User account database

View the user account database

[root@daddylinux~]# cat /etc/passwd |more

Display last 10 records

[root@daddylinux~]# tail /etc/passwd

Display last 5 records

[root@daddylinux~]# tail –n5 /etc/passwd

• Group account database

View the group account database

[root@daddylinux~]# cat /etc/group |more

[root@daddylinux~]# tail /etc/group

• How to delete user account

View the current account

[root@daddylinux~]# tail /etc/passwd

Delete with home folder

[root@daddylinux~]# userdel –r username

Delete without home folder

[root@daddylinux~]# userdel username

Verify the account
User account - [root@daddylinux~]# tail /etc/group
Home folder -  [root@daddylinux~]# ls -l /home

• Deleting Groups

View current groups

[root@daddylinux~]# tail /etc/group

Delete the group

[root@daddylinux~]# groupdel groupname

Verify group

[root@daddylinux~]# tail /etc/group