Creating A New SharePoint Service Admin Account

Question

We want to create a new SharePoint Service Admin account that will have Farm administrator privileges exactly the same as the existing Farm account.

[EDIT] I need this to work for 2007, 2010 and 2013 environments.

The reason for this is so we can run a third part tool under this account that runs on another server without having to give direct access to our SharePoint servers.

What are the set of steps we need to follow to give a service account the same permissions in SharePoint as our existing Farm admin account?

Answer 1

How about adding the account to the Farm Administrators Group in Central Admin?

1. Open Central Admin.
2. Under Security click on the link Manage the farm administrators group.
3. Click New to add the user to the group.

Second step:

1. Open SharePoint Powershell prompt
2. Run Add-SPShellAdmin -username domain\account