How To Create User Account In Unix

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:

passwd login_name

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