PowerTip: Verify If File Changes by Computing Hash

The Scripting Guys

Dr Scripto

Summary: Use Windows PowerShell and compute a hash to verify if a file changes.

Hey, Scripting Guy! Question How can I use Windows PowerShell in Windows 8.http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg9/04/hsg-02-http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg7-http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg0-03.jpg9/04/questsoftware.png9/04/a-sm.jpg9/04/q-sm.jpg to ensure that my Windows PowerShell profile
          does not change without me knowing it?

Hey, Scripting Guy! Answer Use the Get-FileHash cmdlet and store the returned object somewhere (for example, export it
          to an XML file, or store the hash in a file or in the registry). When you suspect changes, use the 
          Get-FileHash cmdlet again, and compare the two objects by using the Compare-Object cmdlet:

$hash = Get-FileHash $profile

$hashhttp://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg9/04/hsg-02-http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg7-http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg0-03.jpg9/04/questsoftware.png9/04/a-sm.jpg9/04/q-sm.jpg = Get-FileHash $profile

Compare-Object $hash $hashhttp://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg9/04/hsg-02-http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg7-http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg9/04/hsg_perf4_0http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/20http://devblogs.microsoft.com/scripting/wp-content/uploads/sites/29/2019/04/2010_scriptgames_badge1.png9/04/hsg_perf3_02.jpg.jpg0-03.jpg9/04/questsoftware.png9/04/a-sm.jpg9/04/q-sm.jpg -Property hash

Note  If nothing has changed, nothing returns.

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