As a SharePoint Online global administrator, you can use the SharePoint Online Management Shell to efficiently manage users, sites, and organizations in addition to using the SharePoint Online Administration Center.
What is the SharePoint Online Management Shell?
The SharePoint Online Management Shell is a Windows PowerShell module. You can use it to manage SharePoint Online users, sites, site collections, and organizations from the command line, instead of using the SharePoint Administration Center user interface.
For more information and to get started using PowerShell with SharePoint Online, see the TechNet article, Introduction to the SharePoint Online Management Shell.
How do the SharePoint Online admin center and SharePoint Online Management Shell compare?
The SharePoint Online admin center enables you to view information about your organization's SharePoint sites and users using your web browser. If you are new to Office 365 and SharePoint Online, the SharePoint Online admin center is a good place to start. For information about using the admin center, see Manage site collections and global settings in the SharePoint admin center.
The SharePoint Online Management Shell enables you to manage users, sites, and site collections using command-line operations. After you become familiar with SharePoint Online features and technologies, try using SharePoint Online commands, especially when you want to manage lots of users, sites, or site collections. For more information, see the TechNet article, Introduction to the SharePoint Online Management Shell.