(Get-LocalUser).Name | Out-File C:localusers.txt

ForEach ($User in Get-Content C:localusers.txt)
{
    If ($User -match "administrator" -or "kahuna")
    {
        Write-Host True
    }
    Else
    {
        Write-Host False
    }
}

If ($User -match "administrator" -or $User -match "kahuna")

If (($User -match "administrator") -or ($User -match "kahuna"))

If (($true) -or ($false))