title: How do I assign a null value to a variable in PowerShell?
body: <p>I want to assign a null value to a variable called <code>$dec</code>, but it gives me errors. Here is my code:</p>
  
  <pre><code>import-module activedirectory
  $domain = "domain.example.com"
  $dec = null
  Get-ADComputer -Filter {Description -eq $dec}
  </code></pre>