Today I just came across a scenario where which I need bit to exclude some folder inside my parent folders while doing a comparison. I
know there is - Exclude for Get-ChildItem , but unfortunately this seems not
working good for folders /file together and my scenario.
Assume we have a folder structure as below and we want to compare “C:\ Source” and “D:\ Destination” recursively by excluding the files in D:\ XXXXXX and D:\ YYYYYY with any difference in XXXXXX.txt to be picked up.
|-XXXXXX
| |File1.txt
| |File2.txt
| |File3.txt
|-FolderA
| |File4.txt
| |File5.txt
| |File6.txt
|-FolderB
| |File1.txt
| |File2.txt
| |File3.txt
|- YYYYYY
| |File1.txt
| |File2.txt
| |File3.txt
|- XXXXXX.txt
|- XXXXXX
| |File1.txt
| |File2.txt
| |File3.txt
| |File4.txt
|-FolderA
| |File4.txt
| |File5.txt
| |File6.txt
|-FolderB
| |File1.txt
| |File2.txt
| |File3.txt
|- YYYYYY
| |File1.txt
| |File2.txt
| |File3.txt
| |File4.txt
|- XXXXXX.txt
Clear
Compare-Object -ReferenceObject $hashSource.Hash -DifferenceObject $hashDestination.Hash | % { If ($_.Sideindicator -ne " ==") {$diff+=1} }
{
#If yes, we have a difference
return $true
}
else
{
#If yes, we have a difference
return $false
}
{
param(
#Source Path Eg: "D:\temp\Source"
$Source,
#Destination Path Eg: "D:\temp\Destination"
$Destination,
#Regular Expression for Folder Exclusion Eg:"\w*\\YYYYYY\\\w*|\w*\\XXXXXX\\\w*"
$ExcludeList
)
Compare-Object -ReferenceObject $hashSource.Hash -DifferenceObject $hashDestination.Hash | % { If ($_.Sideindicator -ne " ==") {$diff+=1} }
#Check if $diff not equal to zero
If($diff -ne 0)
{
#If yes, we have a difference
return $true
}
else
{
#If yes, we have a difference
return $false
}
}
#Compare the folders using the function
if(Compare-Folders -Source $SourceFolder -Destination $DestinationFolder -ExcludeList "\w*\\YYYYYY\\\w*|\w*\\XXXXXX\\\w*")
{
Write-Host "Changes Found"
}
else
{
Write-Host "No Changes Found"
}
Finally found a way
to do this by using the below code, which exclude any folders in the regular
expression.
Assume we have a folder structure as below and we want to compare “C:\ Source” and “D:\ Destination” recursively by excluding the files in D:\ XXXXXX and D:\ YYYYYY with any difference in XXXXXX.txt to be picked up.
C:
|Source|-XXXXXX
| |File1.txt
| |File2.txt
| |File3.txt
|-FolderA
| |File4.txt
| |File5.txt
| |File6.txt
|-FolderB
| |File1.txt
| |File2.txt
| |File3.txt
|- YYYYYY
| |File1.txt
| |File2.txt
| |File3.txt
|- XXXXXX.txt
D:
|Destination|- XXXXXX
| |File1.txt
| |File2.txt
| |File3.txt
| |File4.txt
|-FolderA
| |File4.txt
| |File5.txt
| |File6.txt
|-FolderB
| |File1.txt
| |File2.txt
| |File3.txt
|- YYYYYY
| |File1.txt
| |File2.txt
| |File3.txt
| |File4.txt
|- XXXXXX.txt
Below code will
fulfill the requirements. This will compare the source and destination folders
by excluding any folders with name XXXXXX and YYYYYY. But this will also pick
up any changes to files with same name in regular Expression Eg XXXXXX.txt or YYYYYY.txt
Clear
#Arrive at the hash of
destination folder by excluding the folders in regular expression
"\w*\\XXXXXX\\\w*|\w*\\YYYYYY\\\w*"
$hashDestination=Get-ChildItem
-Path "D:\temp\Destination"
-Recurse | where {$_.FullName -notmatch "\w*\\XXXXXX\\\w*|\w*\\YYYYYY\\\w*" } |Get-FileHash -Algorithm
"SHA256"
#Arrive at the hash of
Source folder by excluding the folders in regular expression
"\w*\\XXXXXX\\\w*|\w*\\YYYYYY\\\w*"
$hashSource=Get-ChildItem
-Path "D:\temp\Source"
-Recurse | where {$_.FullName -notmatch "\w*\\XXXXXX\\\w*|\w*\\YYYYYY\\\w*" } |Get-FileHash -Algorithm
"SHA256"
$diff
= 0
#Compare the hash we
got and increment $diff if we have a
difference Compare-Object -ReferenceObject $hashSource.Hash -DifferenceObject $hashDestination.Hash | % { If ($_.Sideindicator -ne " ==") {$diff+=1} }
#Check if $diff not
equal to zero
If($diff -ne 0){
#If yes, we have a difference
return $true
}
else
{
#If yes, we have a difference
return $false
}
A much mature version
of the same logic can be found below. Which encapsulate the logic in reusable
function Compare-Folders
clear
function
Compare-Folders{
param(
#Source Path Eg: "D:\temp\Source"
$Source,
#Destination Path Eg: "D:\temp\Destination"
$Destination,
#Regular Expression for Folder Exclusion Eg:"\w*\\YYYYYY\\\w*|\w*\\XXXXXX\\\w*"
$ExcludeList
)
#Arrive at the hash of Source folder by
excluding the folders in regular expression
"\w*\\XXXXXX\\\w*|\w*\\YYYYYY\\\w*"
$hashSource = Get-ChildItem -Path $Source -Recurse
| where {$_.FullName -notmatch $ExcludeList
} |Get-FileHash
-Algorithm "SHA256"
#Arrive at the hash of destination folder
by excluding the folders in regular expression
"\w*\\XXXXXX\\\w*|\w*\\YYYYYY\\\w*"
$hashDestination = Get-ChildItem -Path $Destination
-Recurse | where {$_.FullName -notmatch $ExcludeList } |Get-FileHash -Algorithm
"SHA256"
$diff =
0
#Compare the hash we got and increment $diff if we have a difference Compare-Object -ReferenceObject $hashSource.Hash -DifferenceObject $hashDestination.Hash | % { If ($_.Sideindicator -ne " ==") {$diff+=1} }
#Check if $diff not equal to zero
If($diff -ne 0)
{
#If yes, we have a difference
return $true
}
else
{
#If yes, we have a difference
return $false
}
}
$SourceFolder="D:\temp\Source"
$DestinationFolder="D:\temp\Destination"#Compare the folders using the function
if(Compare-Folders -Source $SourceFolder -Destination $DestinationFolder -ExcludeList "\w*\\YYYYYY\\\w*|\w*\\XXXXXX\\\w*")
{
Write-Host "Changes Found"
}
else
{
Write-Host "No Changes Found"
}
