#region Check x64 host
if( [System.IntPtr]::Size -ne 8) {
  Write-Error "Please use a x64 PowerShell host!"
  return
}
#endregion

#region Load SharePoint SnapIn and DLL
  Remove-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
  Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
  
  [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint") | out-null    
  
  #Check available SharePoint Cmdlets
  if( (Get-Command -Noun SPWeb*) -eq $null ) {
    Write-Error "SharePoint SnapIn not loaded. SharePoint cmdlets missing!"
    return
  }
#endregion

#User must be set as Full Control *Admin* and with Full Control *Permission* on Central Admin->Manager Service Application->User Profiler Service App!!

$site=(Get-SPSite "http://sharepoint.local")
$sc = [Microsoft.Office.Server.ServerContext]::GetContext($site)

$upm = New-Object "Microsoft.Office.Server.UserProfiles.UserProfileManager" -ArgumentList ($sc)
$enumerator = $upm.GetEnumerator()
$enumerator.Reset()
while( $enumerator.MoveNext() -eq $true ) {
  $currentUserProfile = $enumerator.Current
  $propertiesCollection = $currentUserProfile.ProfileManager.PropertiesWithSection
  if( $currentUserProfile -ne $null -and $propertiesCollection -ne $null ) {
    foreach($p in $propertiesCollection) {
      Write-Output $p.Name $currentUserProfile[$p.Name].Value
    }
    
    #write to a property:
    #$currentUserProfile["FirstName"].Value="Test"
    #$currentUserProfile.Commit()
  }
}