How to use PowerShell for Active Directory tasks

How would I do the following in PowerShell?

1.  I want to edit the Telephone Number, Mobile and Fax properties in multiple users.
2.  I only want to edit those properties if any or all of them are populated with a dash ( - ).
3.  If those properties are populated with a dash ( - ), then I would like to remove it and leave the property empty.  

This is meant to be done to all users in a domain with 2 thousand users and has a structure of many OUs.

Thanks!!
TechnijianSupportAsked:
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Jamie McKillopIT ManagerCommented:
Hello,

Try this:

$users = Get-User -ResultSize unlimited
foreach ($user in $users) {
	if ($user.telephoneNumber -eq "-") {
		$user.telephoneNumber = $null
	}
	If ($user.mobile -eq "-") {
		$user.mobile = $null
	}
	If ($user.facsimileTelephoneNumber -eq "-") {
		$user.facsimileTelephoneNumber = $null
	}
	Set-User $user.distinguishedname
}

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JJ
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