MD5 hash files in list provided in text file via PowerShell on Win7

md5hash.ps1

<# Public Domain. Use this however you wish!

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
   OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#>

$files = Get-Content "file_path_on_each_line.txt"
Write-Output "File Path,MD5 Hash"
foreach ($f in $files) {
  $hash = $(certUtil -hashFile $f MD5)[1] -replace " ",""
  Write-Output "$f,$hash"
}

# or do it recursively
Write-Output "File Path,MD5 Hash"
Get-ChildItem -Recurse | where { ! $_.PSIsContainer } |
    ForEach-Object {
        $hash = $(certUtil -hashFile $_.FullName MD5)[1] -replace " ",""
        Write-Output "$_,$hash"
    }