Powershell to list accounts of shared mailboxes

In Exchange if you right click a mailbox and select "Manage Full Access Permission" it will show a list of who has access to that particular mailbox. I need a powershell script that list these accounts/mailboxes. Is there a way to do this?
CiscoAznAsked:
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Mohammad Mahboob RahmatiSr . IT System Administration EngineerCommented:
To Display all of the existing Shared Mailboxes

1 - Get-Mailbox <Identity> -RecipientTypeDetails SharedMailbox

Adjustments & Customizations | Remove unnecessary fields from the output

2 -Get-Mailbox <Identity> -RecipientTypeDetails SharedMailbox | Select Alias

or if you want to check the list of shared Mailboxes with Access Permission use below command.

Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails SharedMailbox | Get-MailboxPermission | ? {$_.User -ne "NT AUTHORITY\SELF" -and $_.IsInherited -ne $true -and $_.user -notlike "S-1-5-*" -and $_.AccessRights -eq "FullAccess"} | ft Identity,@{n="User";e={(get-user $_.user).userprincipalname}},AccessRights,IsInherited -AutoSize

for more info please check below link.

http://o365info.com/shared-mailbox-powershell-commands/
CiscoAznAuthor Commented:
Is there a way to run this on a particular OU first?
Jason CrawfordTransport NinjaCommented:
No sense in reinventing the wheel.  This one was provided by The Google:

https://exchangeserverpro.com/list-users-access-exchange-mailboxes/

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