Compare two locations, report on differences

This topic contains 6 replies, has 3 voices, and was last updated by  Ian 3 years, 3 months ago.

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  • #15143


    Compare two folder locations, report on differences and copy over files from source if changes are under max size.

    I need the script to ensure large amount of changes are not occurring without my knowledge

    Script compares the files in the source and destination and makes note of the changed files in the source location
    – file is a new file (compared to destination)
    – file has been modified (compared to destination)
    – if a file is deleted from source, (don't care, doesn't add to max size)
    Grab the total size of those new/changed files:
    if size is less than max size:
    -do a robocopy /mir to the destination
    -log all files changed to a specific location
    if size is greater than max size
    -send an email to to let them know the source location, destination location and total size
    -script logs information to specific location.

    $maxsizeinchanges = 100MB
    $date = Get-Date -UFormat "%Y-%m-%d"
    $source = Get-ChildItem -Path C:\TEMP\location1 -Recurse | Measure-Object -Property length -Sum
    $sourcesize = "{0:N2}" -f ($source.sum / 1MB) + " MB"
    $destination = Get-ChildItem -Path C:\TEMP\location2 -Recurse | Measure-Object -Property length -Sum
    $destinationsize = "{0:N2}" -f ($destination.sum / 1MB) + " MB"
    $totalsize = "{0:N2}" -f (($source.Sum + $destination.Sum) / 1MB) + "MB"
    $sizediff = [System.Math]::Abs($destination.Sum - $source.Sum)
    if($sizediff -lt $maxsizeinchanges)
        #Do a robocopy /mir to the destination
        #Log all files changed to specific location
        robocopy C:\TEMP\location1 C:\TEMP\location2 /MIR /IS /L /R:3 /W:3 >> C:\TEMP\logs\$date.txt
        Send-MailMessage -To "You " -from "Me " -Subject $date -Body "test" -SmtpServer smtprelay.server

    I've written the code above but i'm only able to check the size difference between the source and the destination. If the $sizediff is less than the $maxsizeinchanges then proceed with the robocopy mirror, if not then send an email to

    I need to somehow keep track of which files are getting modified and which files are new. Then get the size of these files and compare it to $maxsizeinchanges. Any ideas on how i can do that?

  • #15159


    Alright, so i've decided to take this on with a different approach.

    "robocopy C:\TEMP\location1 C:\TEMP\location2 /MIR /IS /L /R:3 /W:3 >> C:\TEMP\logs\$date.txt" will give me the output below into a text file.

    ROBOCOPY :: Robust File Copy for Windows

    Started : Friday, May 9, 2014 8:00:44 AM
    Source : C:\TEMP\location1\
    Dest : C:\TEMP\location2\

    Files : *.*

    Options : *.* /L /S /E /DCOPY:DA /COPY:DAT /PURGE /MIR /IS /R:3 /W:3


    14 C:\TEMP\isantillan1\
    Same 190 20amp.txt
    Same 49597 AppC_Field_Methods.docx
    Same 65770 Appendix_d_qaqc.docx
    Newer 46031 Capture.PNG
    Newer 23517 Capture1.PNG
    Same 50041 Capture2.PNG
    Newer 43427 Capture3.PNG
    New File 7304 franklin_and_prokopik_inv_199451_amount_$216.10 _for_claim_PL-00-00-0564-test.pdf
    New File 7415 franklin_and_prokopik_inv_199451_amount_$216.10 _for_claim_PL-00-00-0564.pdf
    New File 535040 PhotomergeUI.8BF
    New File 15.0 m public_drive_log.txt
    New File 15657 test.docx
    New File 4053 tvik_log.txt
    New File 1062 tvik_log2.txt

    Is there a way for me to output this into an object? Once i have this object, i would like to grab the ones that are "Newer" and "New file" and put it into another object. With this new object, i will get the size of this object and compare it to $maxsizeinchange. If the size difference is less than the $maxsizeinchanges then proceed with the robocopy mirror, if not, then send an email to

  • #15160

    Don Jones

    The output from Robocopy is pure text – to turn that into an object, you'd have to parse the text for whatever information you wanted.

  • #15196


    Found this old article by you Don. I'll give it a shot and let you know how it goes.

  • #15223


    I was able to get what i need by doing the following code, (see attached file)

    Select-String -Path C:\TEMP\logs\2014-05-09.txt -Pattern "Newer", "New File"

    I will then get this output from the code above.

    C:\TEMP\logs\2014-05-09.txt:20: Newer 46031 Capture.PNG
    C:\TEMP\logs\2014-05-09.txt:21: Newer 23517 Capture1.PNG
    C:\TEMP\logs\2014-05-09.txt:23: Newer 43427 Capture3.PNG
    C:\TEMP\logs\2014-05-09.txt:24: New File 7304 franklin_and_prokopik_inv_199451_amount_$216.10 _for_claim_PL-00-00-0564-test.pdf
    C:\TEMP\logs\2014-05-09.txt:25: New File 7415 franklin_and_prokopik_inv_199451_amount_$216.10 _for_claim_PL-00-00-0564.pdf
    C:\TEMP\logs\2014-05-09.txt:26: New File 535040 PhotomergeUI.8BF
    C:\TEMP\logs\2014-05-09.txt:27: New File 15.0 m public_drive_log.txt
    C:\TEMP\logs\2014-05-09.txt:28: New File 15657 test.docx
    C:\TEMP\logs\2014-05-09.txt:29: New File 4053 tvik_log.txt
    C:\TEMP\logs\2014-05-09.txt:30: New File 1062 tvik_log2.txt

    with this tho, I would like to just get the filenames above and get their file size by doing :
    Get-ChildItem -Path C:\TEMP\isantillan1 -Recurse | Measure-Object -Property length -Sum

    How do i go on about doing this?

  • #15276

    Daniel Schroeder

    I'm sure there's a much more elegant way to do this, but this code will work for you:

    $path = "C:\temp\TF.iQmetrix.CheckinPolicies.txt"
    $patterns = @("test", "is")
    # Get all of the lines contains one or more patterns and loop through them.
    $linesContainingPattern = (Select-String -Pattern $patterns -Path $path)
    $fileNames = [string[]]@()	# Initialize empty string array to hold file names.
    foreach ($line in $lines)
    	# If we can find the FileName in this line.
    	$match = [regex]::Match($line, "^(?.*?):(?!\\)") # Regex grabs all text from the start of the line until the first colon not followed by a backslash.
    	if ($match.Success)
    		# Get the FileName out of the line and add it to our array of file names.
    		$fileName = $match.Groups['FileName'].Value
    		$fileNames += $fileName
  • #15287


    Hey Daniel, would you be able to attach "TF.iQmetrix.CheckinPolicies.txt” or post the contents of it?

    Is there a way to grab the last part of the line up to the 1st space? What i actually need are the files names within that line of text where the pattern matches.

    "Capture.PNG", "Capture1.PNG", "Capture3.PNG", "franklin_and_prokopik_inv_199451_amount_$216.10", etc

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