I have a simple powershell script that runs fine when I execute it from the powershell editor, but yields entirely different results when I run it from Windows Task Scheduler.

Original code is below ... simply want to copy the latest file from the m: drive.

$OriginalDir = "M:"
$BackupDir = "c:\downloads\db"
$LatestFile = Get-ChildItem -path m:  -Name -ErrorAction SilentlyContinue | 
Sort-Object LastWriteDate -descending | select -last 1
Write-OutPut $LatestFile
write-output $LatestFile | add-content C:\Scripts\Log.txt
#Copy-Item -path $OriginalDir\$LatestFile $BackupDir\$LatestFile

Testing against Contents in the "M" drive:

List of files

When run from the powershell editor, I get the latest file (20170720 (Thursday).bak). When I run from Windows task scheduler, I get 20170717 (Monday).bak. I'm running from the same account, and am at a loss as to what is going on.

Any ideas?


  • 1
    LastWriteDate -> LastWriteTime – PetSerAl Jul 21 '17 at 16:23
  • It yields the same result using LastWriteTime (I used that first, but have been grasping at straws trying to get this to work). Thanks! – Larry M Jul 21 '17 at 17:24
  • Is M: a mapped drive? ...or is the scheduled task set to run with highest privileges to include hidden files or vice versa? – Itchydon Jul 21 '17 at 19:42
  • m is a mapped drive. – Larry M Jul 21 '17 at 20:42
  • Might be worth ensuring both M: are mapped to the same place. If they are I would try running the scheduled task with highest privileges, and then running it again but this time not with highest privileges and see if the results are the same – Itchydon Jul 23 '17 at 21:19

(For some reason can't access the other account ... original poster here). I checked the mapped drive, it was the same on both. Tried running with different rights, same. Ended up matching on the first 8 characters of the filename (example below):

$filedate = (get-date).AddDays(-1).tostring('MMddyyyy')     
$LatestFile = Get-ChildItem -Path $OriginalDir -Name "$filedate*.bak" | Sort LastWriteTime | Select -First 1

(This worked when run from Task Scheduler and via the PS Editor)

Thanks for all of the help! Still is/was strange behavior.

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