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Dynamic collection to compare two values

Goal: Compare two files (one local to the client computer, one on a fileshare), and store in the collection if the local file is older than the one on the fileshare.

This is for a vendor application that does not use version numbers etc, and the installer file is updated by a 3rd-party. I do not want to rely on the 3rd-party informing we when they have updated the installer.

The ultimate goal is for a set-and-forget setup where every time the file on the fileshare (the installer) is updated, PDQ will go out and update clients as they enter the dynamic collection.

Is there a way to achieve this in PDQ Inventory?

I understand there is a manual method of setting environment variables yourself when the program is updated, but I am going for a set-and-forget setup here.

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Date Votes
    1. Back up your PDQ Inventory database.
    2. Create a Custom Variable in PDQ Inventory. In my example I created "File_Timestamp".
    3. Create a PowerShell script to query the file on the fileshare and update "File_Timestamp". Create a Scheduled Task or a PDQ Deploy package and schedule to run this at your desired interval.
      $File_Modified_Time = ( Get-ItemProperty \\Path\To\File ).LastWriteTime
      $PDQ_Update_Time = Get-Date -Format "yyyy-MM-dd HH:mm:ss"

      sqlite3 "C:\ProgramData\Admin Arsenal\PDQ Inventory\Database.db" "UPDATE CustomVariables SET Value = $($File_Modified_Time) WHERE Name = 'File_Timestamp';"
      sqlite3 "C:\ProgramData\Admin Arsenal\PDQ Inventory\Database.db" "UPDATE CustomVariables SET Modified = $($PDQ_Update_Time) WHERE Name = 'File_Timestamp';"
    4. Create a Dynamic Collection that compares Date Modified to "File_Timestamp".


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  • This is a workable workaround, thanks. I am making sure to leave a delay between running this package and my application package, as the dynamic collection isn't picking up the change instantly.

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