Mass file copy to domain computers - powershell

Question

I am trying to take a screen saver file I've made and copy it to all of our desktops and laptops \system32 folder. I created a computers text file and found this script, but I keep getting this error. Any help would be appreciated.
Running this in Powershell 3.0 on a 2012 Server logged in as an admin.
$computers = gc "\\server\share\scripts\computers.txt"
$source = "\\share\scripts\MySlideshow.scr"
$dest = "C:\Windows\System32"
foreach ($computer in $computers) {
if (test-Connection -Cn $computer -quiet) {
Copy-Item $source -Destination \\$computer\$dest -Recurse
} else {
"$computer is not online"
}
}
Error:
Copy-Item : The given path's format is not supported.
At C:\users\tech\desktop\scripts\screen.ps1:6 char:9
+ Copy-Item $source -Destination \\$computer\$dest -Recurse
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Copy-Item], NotSupportedException
+ FullyQualifiedErrorId : System.NotSupportedException,Microsoft.PowerShell.Commands.CopyItemCommand

Answer 1

The resulting UNC format for you destination is invalid. You're passing
"\\computer\c:\windows\system32"
when you should be passing
"\\computer\c$\windows\system32"
Try quoting the -destination parameter like this too:
Copy-Item $source -Destination "\\$computer\$dest" -Recurse
You'll also need to use single-quotes when assigning to $dest to prevent powershell from trying to expand the dollar sign as a variable sigil.
$dest = 'c$\windows\system32'
Debug your script by using copy-item -whatif ... to ensure that you're passing the correct parameters.