How To Find Non-tagged ESXi Hosts

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There are plenty of scripts to find tagged ESXi hosts. But what if you want to find out all ESXi hosts not be tagged? Following is a simple script:
Compare-Object ((Get-VMHost | Get-TagAssignment).Entity | select -uniq) (Get-VMHost)

The output is similar like following:
InputObject      SideIndicator
-----------      -------------
esx1         =>  
esx2         =>  
esx3         =>

The => indicates ESXi hosts in InputObject are not tagged.

If return is nothing, it means all ESXi hosts are tagged.

Please refer to "Using the Compare-Object Cmdlet" for detail.

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