1) Login the system as root.
2) cd /usr/sbin
3) Enter the following at the shell prompt to create a new account:
useradd [login name] -g [initial group name] -G [supplementary group names] -p [password]
4) You need to give the new user a password for the new account.
Enter the following command:
You will be asked to enter a password for login_name.
userdel - to delete an account
groups - to list all group names for the current user
Add an existing user to an existing group
usermod -a -G groupid userid
Change an existing user primary group
usermod -g groupid
Find out which group a user belongs to
List all users (even those not logged in)
cat /etc/passwd | cut -d ":" -f1