Sometimes, we would like to create an account through SSH which allows us to create an account faster than going through WHM. With this, we can accomplish this task with whmapi1.
While logged in through SSH as the user root, you can go through and create an account with the following createacct command:
whmapi1 createacct username='username' domain='example.com'
This will create a random password in the output that you can provide to your clients. If you would like to specify the password you can use the password flag similar to this:
whmapi1 createacct username='username' domain='example.com' password='password'
Some more information, as well as additional options, can be located here.