Exporting private key for user with powershell


I'd like to be able to set the User's name, then export the certificate + private key to my desktop. For example, we are using the 'Enroll on behalf of feature' to enroll User certificates for our users.

I'd like Powershell to prompt me for the user's full name, then export the cert + private key. I found something that will export all the certificates + private keys in the User store, but I just need to define one user:

dir cert:\currentuser\my | 
  Where-Object { $_.hasPrivateKey } | 
  Foreach-Object { [system.IO.file]::WriteAllBytes(
    ($_.Export('PFX', 'secret')) ) }

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Can you help spruce this up? Thanks!
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Just use the appropriate filter, like:
$usr = read-host "User Name: "
dir cert:\currentuser\my |
  ? { $_.hasPrivateKey -and $_.Subject -like "*CN=$usr*" |
  Foreach-Object { [system.IO.file]::WriteAllBytes(
    ($_.Export('PFX', 'secret')) ) }

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