Compare two csv files and find discrepancies - powershell

Question

I am new in powershell world , I got some project on powershell for inventory reconciling .
I am not sure how to proceed on this , I tried some basic steps and I am able to export
users/group/group membership.
Following are the requirements :
Now What I have achieved - Thanks to Govnah
AD query:
Get-QADUser -searchRoot $OuDomain -SizeLimit 0 |
Select-Object dn, sAMAccountName, #{Name="Groups";Expression={(Get-QADMemberOf $_ | Select-Object -expandProperty Name) -join ";"}} |
Sort-Object SamAccountName |
export-csv $FilePath
I have now two csv files likes AD_users.csv and Oracle_users.csv
I want to compare both files and redirect the difference like
AD users does not exist in Oracle
Oracle User does not exist in AD
Sample data
AD_users.csv
u388848993
K847447388
u994888484
Oracle_users.csv
k095848889
u388848993
I can query oracle database , AD query is also fine the only concern is that I am not able to compare the output.

Answer 1

I did it something like this in a script I wrote:
[System.Collections.ArrayList]$adlist = Get-Content c:\users\sverker\desktop\ad.csv |Sort-Object
[System.Collections.ArrayList]$oraclelist = Get-Content c:\users\sverker\desktop\oracle.csv |Sort-Object
$Matching_numbers = #()
ForEach ($number in $adlist)
{
if ($oraclelist.Contains($number))
{
$Matching_numbers += $number
}
}
ForEach ($number in $Matching_numbers)
{
$adlist.Remove($number)
$oraclelist.Remove($number)
}
now $Matching_numbers now contains the matching numbers
and $adlist contains only numbers from AD
and $oraclelist only numbers from Oracle
you can then loop through the list and display values:
Write-Host "Matches:"
ForEach ($value in $Matching_numbers)
{
$Message += $value + [Environment]::NewLine
}
Write-Host $Message
Write-Host "AD only:"
ForEach ($value in $adlist)
{
$MessageAd += $value + [Environment]::NewLine
}
Write-Host $MessageAd
Write-Host "Oracle only:"
ForEach ($value in $oraclelist)
{
$MessageOracle += $value + [Environment]::NewLine
}
Write-Host $MessageOracle
or simply by writing
$Matching_numbers
will output the list to console
You can output the $Message variables to a file or so..
No doubt, there is a nicer way to do it, but this worked for me for a certain type of file.