powershell match multiple variables - powershell

Question

So I read stackoverflow a lot and it always helps me with my understanding, at the moment, I'm a bit stumped on the matching any of multiple variables and as such, thought I'd ask the exports.
A bit of background on my task.
I am a systems admin for an AD forest with multiple child domains (+4), we are going through a process to consolidate these domains into one - however, unfortunately, as each was managed independently we have comes across the age old 'duplicate SAM' issue (and will for sure come across dupe UPNs too once we start digging).
As such - I am trying to build a script to find these duplicates so I can address them with the teams who support the users in these domains.
I've got a fair way through this, I've exported a list of the SAMs for one migrating domain, and I can parse this into PS and have it look up each SAM against all of my domains and either give me a variable with the username OR $null.
So, I now just want to understand what the 'IF' command is for matching more than one variable and showing which ones match.
So, for example, from these variables...
$one="MSmith01"
$oneNT="DOMAIN1\MSmith01"
$two="MSmith01"
$twoNT="DOMAIN2\MSmith01"
$three=$null
$threeNT=$null
$four=$null
$fourNT=$null
$five="MSmith01"
$fiveNT="DOMAIN5\MSmith01"
$six=$null
$sixNT=$null
How do I write the IF command to show me if more than one variable matches??
If I write this:
if ($one -match $two -match $three -match $four -match $five -match $six) {write-host "Duplicate Found - $oneNT, $twoNT, $threeNT, $fourNT, $fiveNT, $sixNT." -foregroundcolor "yellow"}
It will show me :
Duplicate Found - DOMAIN1\MSmith01, DOMAIN2\MSmith01, , , DOMAIN5\MSmith01,.
But, if the variables are:
$one=$null
$oneNT=$null
$two="MSmith01"
$twoNT="DOMAIN2\MSmith01"
$three="MSmith01"
$threeNT="DOMAIN3\MSmith01"
$four=$null
$fourNT=$null
$five=$null
$fiveNT=$null
$six=$null
$sixNT=$null
Then the result seems to ignore the fact that DOMAIN 2 and DOMAIN3 have matching SAMs and it appears that "x -match y -match z" is really actually only comparing x and y, so I get nothing.
Which is obviously incorrect.
Can anyone explain how I compare and look for ANY duplicate amongst several variables?
Thanks
To further elaborate:
To get my variables I'm doing this:
$SAMAccountList=gc "C:\My Documents\Domain2SAMList.txt"
$SamAccountList | % {
$one=Get-QADUser -SamAccountName $_ -IncludedProperties SamAccountName -Server dc.domain1.local | foreach { $_.SAMAccountName }
$oneNT=Get-QADUser -SamAccountName $_ -IncludedProperties NTAccountName -Service dc.domain1.local | foreach { $_.NTAccountName }
$twoSAM=Get-QADUser -SamAccountName $_ -IncludedProperties SamAccountName -Service dc.domain2.local | foreach { $_.SAMAccountName }
$twoNT=Get-QADUser -SamAccountName $_ -IncludedProperties NTAccountName -Service dc.domain2.local | foreach { $_.NTAccountName }
#...
#...
#...etc for each domain
}
This then gives me a set of variables as I mentioned above

Answer 1

I would put them in a customobject and search with the unique names.
$NAMES = #()
$NAMES += [pscustomobject] #{name=$one;nameNT=$oneNT}
$NAMES += [pscustomobject] #{name=$two;nameNT=$twoNT}
$NAMES += [pscustomobject] #{name=$three;nameNT=$threeNT}
$NAMES += [pscustomobject] #{name=$four;nameNT=$fourNT}
$NAMES += [pscustomobject] #{name=$five;nameNT=$fiveNT}
$NAMES += [pscustomobject] #{name=$six;nameNT=$sixNT}
$UniqueNames=($NAMES | Sort-Object -Property name -Unique).Name
ForEach($Uniquename in $UniqueNames){
if($Uniquename -ne $NULL){
$SEARCH_RESULT=$NAMES|?{$_.Name -eq $Uniquename}
if ( $SEARCH_RESULT.Count -gt 1)
{
$SEARCH_RESULT
}
}
}
I get the following results
First data set
name nameNT
---- ------
MSmith01 DOMAIN1\MSmith01
MSmith01 DOMAIN2\MSmith01
MSmith01 DOMAIN5\MSmith01
Second data set
name nameNT
---- ------
MSmith01 DOMAIN2\MSmith01
MSmith01 DOMAIN3\MSmith01