Powershell comparing data in a CSV against files in a folder - excel

Question

I'm fairly new to powershell.
I'm trying to compare data in a CSV File against random files in a specific folder.
I want to see if and what has changed and then log that in another column called "Changed".
Here's what I've done below, it seems to create a new column called 'Changed' but doesn't input the changes in it.
$Spreadsheet = 'C:\Powershell\CSV\inv.csv'
$SpreadSheetPath = "C:\Powershell\CSV"
Import-Csv $Spreadsheet -Delimiter "|" -Encoding Default | ForEach-Object -
{
$Path += $_.Path
$Filename += $_.Filename
$DateModified += $_.DateModified
$FileSize += $_.FileSize
$MD5Hash += $_.MD5Hash
}
{
$Msg1 = "Path changed"
$Msg2 = "File Name changed"
$Msg3 = "Date Modified changed"
$Msg4 = "File Size changed"
$Msg5 = "MD5 changed"
$Msg6 = "Files are the same"
$psdata = "D:\ps-test\data\*.*"
}
If (($Path -eq $psdata))
{
Import-Csv C:\Powershell\CSV\inv.csv |
Select-Object *,#{Name='Changed';Expression={$Msg6}} |
Export-Csv C:\Powershell\CSV\NewSpreadsheet4.csv
}
Else
{
Import-Csv C:\Powershell\CSV\inv.csv |
Select-Object *,#{Name='Changed';Expression={$Msg1}} |
Export-Csv C:\Powershell\CSV\NewSpreadsheet4.csv
}
Here is an example of what the CSV looks like:
Path Filename Date Modified File Size MD5 Hash
D:\ps-test\data adminmodeinfo.htm 03/11/2010 22:42 1079 BD1C9468D71FD33BB35716630C4EC6AC
E:\ps-test\data admintoolinfo.htm 03/11/2010 22:42 868 24B99B6316F0C49C23F27FEA6FF1C6AC
E:\ps-test\data admin_ban.bmp 03/11/2010 22:42 63480 C856F1F3C58962B456E749F2EA9C933A
E:\ps-test\data baseline.dat 03/20/2010 03:18:33 173818 F13183D88AABD1A725437802F8551A06
E:\ps-test\data blueRule.gif 03/11/2010 22:42 815 D1AEFE884935095DAB42DAFD072AA46F
E:\ps-test\data deffactory.dat 03/20/2010 03:18:33 706 862D4DFD2F49021BB7C145BDAFE62F6F
E:\ps-test\data dividerArt.jpg 03/11/2010 22:42 367 F7050C596C097C0B01A443058CD15E35

Answer 1

There are many issues with your code.I will try to highlight a few of the issues, link to documentation and point you in the right direction so that you can resolve your issues. A proper solution would require getting many more requirements, or writing code (off-topic for StackOverflow)
Change
| ForEach-Object -
{
to
| ForEach-Object {
In the Foreach-Object, you are concatenating values from each line because you are using +=.
On the first run, $Path contains D:\ps-test\data.
After the second run, it contains D:\ps-test\dataE:\ps-test\data.
At the end of your test data, it contains D:\ps-test\dataE:\ps-test\dataE:\ps-test\dataE:\ps-test\dataE:\ps-test\dataE:\ps-test\dataE:\ps-test\data
The messages are contained in a script block, but it does not look like this is intentional as this is never executed. So after the scriptblock, the variable $Msg1 has not been created; it's blank.
If (($Path -eq $psdata))
double brackets not required.
will always be false because the variable $psdata does not exist as it was stated inside a script block.
will always be false because you are attempting to equate the strings; your input does not literally contain "D:\ps-test\data\*.*". You probably want -like instead of -eq.
will always be inaccurate because even if the paths are compared, there is no check that the file actually exists on the system.
Useful links
Test-Path to check if file exists.
Get-FileHash to get MD5 hash and compare to file.
Get-ChildItem to get a list of directories/files in a directory.
Write-Output so that you can print variables and make sure they contain what you expect.
about_comparison_operators - -in and -contains will help you.

Answer 2

This is a suggestion to help you get started. It's not complete and not tested! Let me know if it works as expected and if you have any questions.
Import-Csv 'C:\Powershell\CSV\inv.csv' -Delimiter "|" -Encoding Default | foreach {
$Path += $_.Path
$Filename += $_.Filename
$DateModified += $_.DateModified
$FileSize += $_.FileSize
$MD5Hash += $_.MD5Hash
$file = [System.IO.FileInfo](Join-Path $Path $Filename)
if (-not $file.Exists) {
$message = "File does not exist"
}
elseif ($file.LastWriteTime -ne [DateTime]$DateModified) {
$message = "Dates differ"
}
elseif ($file.Length -ne [int]$FileSize) {
$message = "Sizes differ"
}
# and so on...
# (You cannot really compared a changed file name btw)
New-Object -Type PSObject -Prop #{
Path = $Path
Filename = $Filename
DateModified = $DateModified
FileSize = $FileSize
MD5Hash = $MD5Hash
Message = $message
}
} | Export-CSV 'C:\Powershell\CSV\NewSpreadsheet4.csv'