title: Only remove duplicates records from csv file
body: <p>I've tried googling different things, but I can't seem to find an answer.</p>
  
  <h1>Csv Contents</h1>
  
  <pre><code>"ColumnOne","ColumnTwo","ColumnThree"
  "C1V1","C2V1","C3V1"
  "C1V2","C2V2","C3V2"
  "C1V2","C2V2","C3V2"
  "C1V3","C2V3","C3V3"
  </code></pre>
  
  <h1>Code</h1>
  
  <pre><code>$input = 'C:\Temp\test.csv'
  $inputCsv = Import-Csv $input | Select-Object -Unique
  
  $inputCsv | Export-Csv "$input-temp.csv" -NoTypeInformation
  #Move-Item "$input-temp.csv" $input -Force
  </code></pre>
  
  <h1>Output</h1>
  
  <pre><code>"ColumnOne","ColumnTwo","ColumnThree"
  "C1V2","C2V2","C3V2"
  </code></pre>
  
  <h1>Expected output</h1>
  
  <pre><code>"ColumnOne","ColumnTwo","ColumnThree"
  "C1V1","C2V1","C3V1"
  "C1V2","C2V2","C3V2"
  "C1V3","C2V3","C3V3"
  </code></pre>
  
  <p>Is there a way to do this?</p>