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Get-DfsrFileHash

Brian Lich|Last Updated: 3/26/2017

SYNOPSIS

Gets a file hash.

SYNTAX

Get-DfsrFileHash [-Path] <String[]> [<CommonParameters>]

DESCRIPTION

The Get-DfsrFileHash cmdlet gets a hash value identical to the one computed by the Distributed File System (DFS) Replication service for the specified file or folder during normal replication. Use this cmdlet to determine if you correctly populated a content set, or if a file is in sync between replication partners.

EXAMPLES

Example 1: Get a file hash

PS C:\> Get-DfsrFileHash -Path "C:\Rf01\Drawing2.vsd"

Path                                                        FileHash
----                                                        --------
C:\Rf01\Drawing2.vsd                                        6EA20E2D-EAA03FE3-22004718-F1D0FCE2

This command uses the Get-DfsrFileHash cmdlet to retrieve the simulated marshaled hash of the file C:\Rf01\Drawing2.vsd.

Example 2: Retrieve the hash of a folder and its contents

PS C:\> Get-DfsrFileHash -Path "C:\Rf01\*"

Path                                                        FileHash
----                                                        --------
C:\Rf01\archive                                             13B7D499-1D5B4DBF-8800A20D-52CA5845
C:\Rf01\Drawing2.png                                        EA22F7CF-AD58721C-29CB086B-CDE228BC
C:\Rf01\Drawing2.vsd                                        6EA20E2D-EAA03FE3-22004718-F1D0FCE2

This command uses the Get-DfsrFileHash cmdlet to retrieve the hash of a folder and the hashes for the individual files in the folder.

Example 3: Retrieve the hash of a folder and its contents using recursion

PS C:\> Get-DfsrFileHash -Path (Get-ChildItem -Path "C:\Rf01" -Recurse).fullname

Path                                                        FileHash
----                                                        --------
C:\Rf01\archive                                             13B7D499-1D5B4DBF-8800A20D-52CA5845
C:\Rf01\Drawing2.png                                        EA22F7CF-AD58721C-29CB086B-CDE228BC
C:\Rf01\Drawing2.vsd                                        6EA20E2D-EAA03FE3-22004718-F1D0FCE2
C:\Rf01\archive\Drawing1.png                                A32E700D-E541F7B7-241CD9B3-D1EA9D6C
C:\Rf01\archive\Drawing1.vsd                                DA61DD74-52BDCB8E-2A793467-EB4BCED0

This command uses the Get-DfsrFileHash cmdlet to retrieve the hash of a folder and the hashes for the individual files in the folder. The command also uses the Get-ChildItem cmdlet to recursively find all files and folders in the path.

Example 4: Retrieve the hash of files with the *.png extension

PS C:\> Get-DfsrFileHash -Path (Get-ChildItem -Path "C:\Rf01" -Recurse -Filter *.png ).fullname

Path                                                        FileHash
----                                                        --------
C:\Rf01\Drawing2.png                                        EA22F7CF-AD58721C-29CB086B-CDE228BC
C:\Rf01\archive\Drawing1.png                                A32E700D-E541F7B7-241CD9B3-D1EA9D6C

This command uses the Get-DfsrFileHash cmdlet to retrieve the hash of all files with a *.png extension. The command searches the folder path recursively.

Example 5: Retrieve and compare file hashes between two replicated folders

PS C:\> net use x: \\Srv01\c$\Rf01
PS C:\> Get-DfsrFileHash x:\* | Out-File C:\Srv01.txt
PS C:\> net use x: /d
PS C:\> net use x: \\Srv02\e$\data
PS C:\> Get-DfsrFileHash x:\* | Out-File C:\Srv02.txt
PS C:\> net use x: /d
PS C:\> Compare-Object -ReferenceObject (Get-Content C:\Srv01.txt) -DifferenceObject (Get-Content C:\Srv02.txt) -IncludeEqual
InputObject                                                 SideIndicator
-----------                                                 -------------
                                                            ==
Path                                                    ... ==
----                                                    ... ==
x:\archive                                              ... ==
x:\Drawing2.vsd                                         ... ==
                                                            ==
                                                            ==
x:\Drawing2.png                                         ... =>
x:\Drawing2.png                                         ... <=

This example retrieves and compares simulated file hashes for two replicated folders on different computers.

The first command maps a drive to the replicated folder on the first computer.

The second command uses the Get-DfsrFileHash cmdlet to retrieve the simulated file hashes for the contents of the folder. The command saves the output to a text file.

The third command deletes the mapped drive for the first computer.

The fourth command maps the same drive letter to the replicated folder on the second computer.

The fifth command uses the Get-DfsrFileHash cmdlet to retrieve the simulated file hashes for the contents of the folder. The command saves the output to a text file.

The sixth command deletes the mapped drive for the second computer.

The seventh command uses the Compare-Object cmdlet to compare the two output files and display the results. In this example, the Drawing2.png files differ.

PARAMETERS

-Path

Specifies an array of paths to files or folders. You can use local paths, mapped drives, or UNC paths.

If you specify a file or folder with a wildcard character, this cmdlet calculates any matching files or folders individually. If you specify a folder path that ends with a wildcard descriptor, such as C:\Rf01*, the cmdlet calculates hashes for all immediate contents of that folder. This parameter does not support recursion of subfolders and their contents.

Type: String[]
Parameter Sets: (All)
Aliases: FullName

Required: True
Position: 0
Default value: None
Accept pipeline input: True (ByPropertyName, ByValue)
Accept wildcard characters: False

CommonParameters

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters.

INPUTS

String

OUTPUTS

DfsrFileHash

NOTES

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