Solved

How to get boolean result of md5sum from two files in powershell

Posted on 2016-10-01
8
88 Views
Last Modified: 2016-10-06
I had this question after viewing md5sum check using powershell v 1.0.

Hi Experts,
this is an extension to my above question.

could you pls help how to loop thru a directory and get md5sum on each file and find the same file on another directory and run the md5sum and return true or false

Say directory1 has 3 files and directory2 has 10 files.
Loop through each file in directory1 get md5 and find same file in directory2 and get md5 too
Get a summary of each file to a output file

output.txt
file1 = success
file2 = success
file3 = failure (md5 value did not match)
0
Comment
Question by:enthuguy
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 12

Expert Comment

by:Carlo-Giuliani
ID: 41825080
Try something like this

$directory1 = '\\server\share\folder1'
$directory2 = '\\server\share\folder2'

$files = GCI $directory1  

ForEach ($f in $files) {
    $hash1 = Get-FileHash $f.fullname
    $hash2 = Get-FileHash (Join-Path $directory2 $f.name)
    Write-Host $f.name ($hash1 -eq $hash2)
    }

Open in new window

2
 
LVL 82

Expert Comment

by:David Johnson, CD, MVP
ID: 41825091
Function Get-FileHash
{
	[CmdletBinding(DefaultParameterSetName = 'Path')]
	param(
		[System.String[]]
		$Path,

		[Alias('PSPath')]
		[System.String[]]
		$LiteralPath,

		[System.String]
		$Algorithm='SHA256'
	)
	
	# Construct the strongly-typed crypto object
	$hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm)
	
	$pathsToProcess = @()
	
	if($PSCmdlet.ParameterSetName  -eq 'LiteralPath')
	{
		$pathsToProcess += Resolve-Path -LiteralPath $LiteralPath
	}
	else
	{
		$pathsToProcess += Resolve-Path $Path
	}
	
	foreach($filePath in $pathsToProcess)
	{
		if(Test-Path -LiteralPath $filePath -PathType Container)
		{
			continue
		}
		
		try
		{
			# Read the file specified in $FilePath as a Byte array
			[system.io.stream]$stream = [system.io.file]::OpenRead($FilePath)

			# Compute file-hash using the crypto object
			[Byte[]] $computedHash = $hasher.ComputeHash($stream)
		}
		catch [Exception]
		{
			$errorMessage = [Microsoft.PowerShell.Commands.UtilityResources]::FileReadError -f $FilePath, $_
			Write-Error -Message $errorMessage -Category ReadError -ErrorId 'FileReadError' -TargetObject $FilePath
			return
		}
		finally
		{
			if($stream)
			{
				$stream.Close()
			}
		}
		
		# Convert to hex-encoded string
		[string] $hash = [BitConverter]::ToString($computedHash) -replace '-',''

		$retVal = [PSCustomObject] @{
			Algorithm = $Algorithm.ToUpperInvariant()
			Hash = $hash
			Path = $filePath
		}
		$retVal.psobject.TypeNames.Insert(0, 'Microsoft.Powershell.Utility.FileHash')

		$retVal
	}
}

$myobject = @()
$directory1 = read-host('Input Directory 1 Location')
if (!(test-path $directory1)) {
write-output ('invalid path:{0}' -f $directory1)
break
}
$directory2 = read-host('Input Directory 2 Location')
if (!(test-path $directory2)) {
write-output ('invalid path:{0}' -f $directory2)
break
}
if( $directory2[$directory2.Length -1] -ne '\'){
$directory2 += '\'
}
$files = get-childitem -path $directory1 -File
foreach ($file in $files){
$hash = Get-FileHash $file.fullname
$object = new-object -Typename psobject 
$object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.name
$object | add-member -MemberType NoteProperty -Name 'Hash' -Value $hash.Hash
$myobject += $object
}
$myobject2 = @()
foreach ($file in $myobject)
{

$testfile = $directory2 + $file.filename
if(!(Test-path $testfile)) {
write-output ('{0} not found' -f $testfile)
break
}
else {
$successful = '= Success'
$hash = Get-FileHash $testfile
if ($file.hash -ne $hash.hash){
$successful = '= Failure (md5 value not match)'
}
write-output('{0} = {1}' -f $file.fileName,$successful)
$object = new-object -Typename psobject 
$object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.Filename
$object | add-member -MemberType NoteProperty -Name 'Success' -Value $successful
$myobject2 += $object
}
$myobject2 | out-file c:\test2\ee.txt

}

Open in new window

1
 

Author Comment

by:enthuguy
ID: 41825115
Thanks Carlo, that looks neat but I believe 1.0 doesn't support this

thanks David, I will try tonight, as I'm away from my pc. btw how should call this function? how to pass the two directory as parameter  (sorry I'm sort of new to powershell)
0
Revamp Your Training Process

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action.

 
LVL 82

Expert Comment

by:David Johnson, CD, MVP
ID: 41825120
it will ask you.. read-host gets input from standard input which in this case is the keyboard
0
 
LVL 17

Expert Comment

by:Learnctx
ID: 41825150
Using the same function from the other post, I would keep it simple create 2 arrays with a list of files and hashes and then use compare-object to find the differences.

Function Get-FileHash
{
	[CmdletBinding(DefaultParameterSetName = "Path")]
	param(
		[System.String[]]
		$Path,

		[Alias("PSPath")]
		[System.String[]]
		$LiteralPath,

		[System.String]
		$Algorithm="SHA256"
	)
	
	# Construct the strongly-typed crypto object
	$hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm)
	
	$pathsToProcess = @()
	
	if($PSCmdlet.ParameterSetName  -eq "LiteralPath")
	{
		$pathsToProcess += Resolve-Path -LiteralPath $LiteralPath
	}
	else
	{
		$pathsToProcess += Resolve-Path $Path
	}
	
	foreach($filePath in $pathsToProcess)
	{
		if(Test-Path -LiteralPath $filePath -PathType Container)
		{
			continue
		}
		
		try
		{
			# Read the file specified in $FilePath as a Byte array
			[system.io.stream]$stream = [system.io.file]::OpenRead($FilePath)

			# Compute file-hash using the crypto object
			[Byte[]] $computedHash = $hasher.ComputeHash($stream)
		}
		catch [Exception]
		{
			$errorMessage = [Microsoft.PowerShell.Commands.UtilityResources]::FileReadError -f $FilePath, $_
			Write-Error -Message $errorMessage -Category ReadError -ErrorId "FileReadError" -TargetObject $FilePath
			return
		}
		finally
		{
			if($stream)
			{
				$stream.Close()
			}
		}
		
		# Convert to hex-encoded string
		[string] $hash = [BitConverter]::ToString($computedHash) -replace '-',''

		$retVal = [PSCustomObject] @{
			Algorithm = $Algorithm.ToUpperInvariant()
			Hash = $hash
			Path = $filePath
		}
		$retVal.psobject.TypeNames.Insert(0, "Microsoft.Powershell.Utility.FileHash")

		$retVal
	}
}

$arr1 = gci -Recurse c:\temp\folder1 | % {
	Get-FileHash $_.fullname} | select `
		@{n="Hash";e={$_.item("hash")}}, `
		@{n="algorithm";e={$_.item("algorithm")}}, `
		@{n="Path";e={$_.item("path")}
}

$arr2 = gci -Recurse c:\temp\folder2 | % {
	Get-FileHash $_.fullname} | select `
		@{n="Hash";e={$_.item("hash")}}, `
		@{n="algorithm";e={$_.item("algorithm")}}, `
		@{n="Path";e={$_.item("path")}
}

Compare-Object -ReferenceObject $arr1 -DifferenceObject $arr2 -Property hash | % {
	$indicator = $_
	if ($indicator.sideindicator -eq "<=")
	{
		$arr1 | ? {$_.hash -eq $indicator.hash}
	}
	else
	{
		$arr2 | ? {$_.hash -eq $indicator.hash}
	}
}

Open in new window


I find Compare-Object a simple way to compare arrays.
1
 

Author Comment

by:enthuguy
ID: 41825255
Hi David,
Thanks very much...that worked fine for me, I will attempt how to pass two directories as arguments to that function.

@Learnctx,
I changed the path in the function but I rece. below blank report. I'm sure I did something wrong...sorry :(

PS C:\parent\scripts> .\compareMD52.ps1

Hash                                                        algorithm                                                   Path
----                                                        ---------                                                   ----
0
 
LVL 82

Accepted Solution

by:
David Johnson, CD, MVP earned 500 total points
ID: 41825502
Test-something -directory1 c:\temp -directory2 C:\test2
Test-something c:\temp C:\test2
Test-something c:\temp c:\test2 -verbose #shows files as compared
Test-something c:\temp c:\test2 -debug #opens output file when done

Function Get-FileHash
{
	[CmdletBinding(DefaultParameterSetName = 'Path')]
	param(
		[System.String[]]
		$Path,

		[Alias('PSPath')]
		[System.String[]]
		$LiteralPath,

		[System.String]
		$Algorithm='SHA256'
	)
	
	# Construct the strongly-typed crypto object
	$hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm)
	
	$pathsToProcess = @()
	
	if($PSCmdlet.ParameterSetName  -eq 'LiteralPath')
	{
		$pathsToProcess += Resolve-Path -LiteralPath $LiteralPath
	}
	else
	{
		$pathsToProcess += Resolve-Path $Path
	}
	
	foreach($filePath in $pathsToProcess)
	{
		if(Test-Path -LiteralPath $filePath -PathType Container)
		{
			continue
		}
		
		try
		{
			# Read the file specified in $FilePath as a Byte array
			[system.io.stream]$stream = [system.io.file]::OpenRead($FilePath)

			# Compute file-hash using the crypto object
			[Byte[]] $computedHash = $hasher.ComputeHash($stream)
		}
		catch [Exception]
		{
			$errorMessage = [Microsoft.PowerShell.Commands.UtilityResources]::FileReadError -f $FilePath, $_
			Write-Error -Message $errorMessage -Category ReadError -ErrorId 'FileReadError' -TargetObject $FilePath
			return
		}
		finally
		{
			if($stream)
			{
				$stream.Close()
			}
		}
		
		# Convert to hex-encoded string
		[string] $hash = [BitConverter]::ToString($computedHash) -replace '-',''

		$retVal = [PSCustomObject] @{
			Algorithm = $Algorithm.ToUpperInvariant()
			Hash = $hash
			Path = $filePath
		}
		$retVal.psobject.TypeNames.Insert(0, 'Microsoft.Powershell.Utility.FileHash')

		$retVal
	}
}

function Test-Something
{
    <#
        .SYNOPSIS
        Short Description
        .DESCRIPTION
        Detailed Description
        .EXAMPLE
        Test-Something
        explains how to use the command
        can be multiple lines
        .EXAMPLE
        Test-Something
        another example
        can have as many examples as you like
        .EXAMPLE
        Test-something -directory1 c:\temp -directory2 C:\test2
         .EXAMPLE
        Test-something c:\temp C:\test2
    #>
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory=$false, Position=0)]
        [Object]
        $directory1 = (read-host('Input Directory 1 Location')),
        
        [Parameter(Mandatory=$false, Position=1)]
        [Object]
        $directory2 =(read-host('Input Directory 2 Location'))

    )
    
        
    if (!(test-path $directory1)) {
        write-output ('invalid path:{0}' -f $directory1)
        break
    }
   
    if (!(test-path $directory2)) {
        write-output ('invalid path:{0}' -f $directory2)
        break
    }
    if( $directory2[$directory2.Length -1] -ne '\'){
        $directory2 += '\'
    }
    $myobject = @()
    $files = get-childitem -path $directory1 -File
    foreach ($file in $files){
        $hash = Get-FileHash $file.fullname
        $object = new-object -Typename psobject 
        $object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.name
        $object | add-member -MemberType NoteProperty -Name 'Hash' -Value $hash.Hash
        $myobject += $object
    }
    $myobject2 = @()
    foreach ($file in $myobject)
    {
        
        $testfile = $directory2 + $file.filename
        if(!(Test-path $testfile)) {
            write-output ('{0} not found' -f $testfile)
            break
        }
        else {
            $successful = '= Success'
            $hash = Get-FileHash $testfile
            if ($file.hash -ne $hash.hash){
                $successful = '= Failure (md5 value not match)'
            }
            write-verbose('{0} = {1}' -f $file.fileName,$successful)
            $object = new-object -Typename psobject 
            $object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.Filename
            $object | add-member -MemberType NoteProperty -Name 'Success' -Value $successful
            $myobject2 += $object
        }
        $myobject2 | out-file c:\test2\ee.txt
       
    }
    if($DebugPreference -ne 'SilentlyContinue') {
     c:\test2\ee.txt
     }
}

Open in new window

1
 

Author Closing Comment

by:enthuguy
ID: 41831443
Thanks very much!!
0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Recently we ran in to an issue while running some SQL jobs where we were trying to process the cubes.  We got an error saying failure stating 'NT SERVICE\SQLSERVERAGENT does not have access to Analysis Services. So this is a way to automate that wit…
This article provides a convenient collection of links to Microsoft provided Security Patches for operating systems that have reached their End of Life support cycle. Included operating systems covered by this article are Windows XP,  Windows Server…
This tutorial will walk an individual through the steps necessary to join and promote the first Windows Server 2012 domain controller into an Active Directory environment running on Windows Server 2008. Determine the location of the FSMO roles by lo…
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…
Suggested Courses

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question