How to replace all Active Directory account photos?

Question

I have a powershell script to replace a single photo:

Import-Module ActiveDirectory
$photo = [byte[]](Get-Content C:\scripts\foto\XXX.jpg -Encoding byte)
Set-ADUser XXX -Replace @{thumbnailPhoto=$photo}

I have a text file with the usernames of the accounts in:

ROB ALAN COY GREGOR

I want to automate replacing all photo in Active Directory. How would I do this?

Answer 1

I could't comprehend Ashigore's probably right one-liner. Here it is broken down line by line into a foreach loop.

$users = get-adUser
foreach ($user in $users){
   $photoPath = "C:\scripts\foto\$($_.SamAccountName).jpg"
   if (Test-Path $photoPath ) {
       $photo = Get-Content "C:\scripts\foto\$($user.SamAccountName).jpg" -Encoding byte
       Set-ADUser $user -Replace @{thumbnailPhoto=$photo}
   }
}