Permissions for Windows PowerShell - SPShellAdmin

Permissions for Windows PowerShell - SPShellAdmin
In order to use Windows PowerShell for SharePoint 2010 Products, a
user must be a member of the SharePoint_Shell_Access role on the
configuration and content database. In addition to this, the user must
also be a member of the WSS_ADMIN_WPG local group on the computer
where SharePoint 2010 Products is installed.

To add a user as SharePoint_Shell_Access on the SharePoint database
use the below powershell cmdlet :

Add-SPShellAdmin

Please Note that to run the above cmdlet you must have
* Membership in the securityadmin fixed server role on the SQL Server instance
* Membership in the db_owner fixed database role on all affected databases
* and local administrative permission on the local computer.

In addition to above some important things to Note:

* The user gets added to the WSS_Admin_WPG group on all Web servers
when the user is added to the SharePoint_Shell_Access role.

* If the target database does not have a SharePoint_Shell_Access role,
the role is automatically created.

* If you use the database parameter, the user is added to the role on
the farm configuration database, the Central Administration content
database, and the specified database. Using the database parameter is
the preferred method because most of the administrative operations
require access to the Central Administration content database. The
cmdlet is something like below :

Add-SPShellAdmin -UserName Domainname\User -database {Database GUID}