Powershell - Comparing groups membership

I am trying to compare the group members of one group to multiple others.

Group1
Group2
Group3

Is there a way in Powershell for me to see if all the users in Group2,Group3 are members of Group1 ? ideally for it to output the SAmAccountNames of missing accounts that are in Group2 and Group3 that are not in Group1
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MilesLoganAsked:
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CorinTackNetwork EngineerCommented:
Powershell includes a cmdlet called Compare-Object that you can use to accomplish this. You would need to first import the AD powershell tool and then use the Get-ADGroupMember cmdlet to pull the list of users from Group 2 and Group 3, then compare them to the members in Group 1. See the following for explanations of these cmdlets.

http://technet.microsoft.com/en-us/library/ee617193.aspx

http://technet.microsoft.com/en-us/library/ee156812.aspx
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SubsunCommented:
You just want to verify if the members of Group2 & Group3 are also members of Group1.. Am I correct?
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MilesLoganAuthor Commented:
Hi Subsub .. yes
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SubsunCommented:
Try this and see if it works for you...
Function Compare-Member ($Source,$Group) {
	$DN = (Get-AdGroup $Source).DistinguishedName
	"Working on group $Group"
	$result = Get-ADGroupMember $Group | % { 
	If (!(Get-ADUser $_.SamAccountName -properties memberOf | 
		? {$_.memberOf -Match $DN})){$_.SamAccountName}
	}
	If ($result){
	"Missing Members"
	$result
	}
	Else{
	"All is well.. :-)"
	}
}

Compare-Member Group1 Group2
Compare-Member Group1 Group3

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MilesLoganAuthor Commented:
Thank you Subsun !!
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