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Update-GlobalAddressList

Use the Update-GlobalAddressList cmdlet to update the recipients included in a global address list (GAL). Exchange PowerShell reference

From the Exchange PowerShell reference 4 parameters Its page in the reference

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Parameters

4 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the global address list that you want to update.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.