PowerShell Providers CMDlets -2

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In this lecture we will take a look at Item property and path cmdlets.

ItemProperty cmdlets

  • New-ItemProperty - creates a new property for a specified item and sets its value.Typically, this cmdlet is used to create new registry values. 
  • Get-itemProperty gets the property of an item like viewing registry properties and their values. You can use this cmdlet to get information about directories, files or registry entries.
  • Remove-ItemProperty – This deletes a property and its value from an item. You can use it to delete registry values and the data that they store.

       Please note: That the registry entry must exist before you can edit the entry. 

      First, we need to create a new registry key in the HKLM registry hive. We will use the New-item  cmdlet.
In the file system, New-Item creates files and folders. In the registry, New-Item creates registry keys and entries.

Be sure to open PowerShell as an Administrator. 

      Using this command we will create a registry key named MyCompany.

Command #1

New-Item -Path "HKLM:\Software\MyCompany" 

Press return 

Displayed is our registry key MyCompany

Now we need to use the command New-itemproperty to add a new registry entry to the MyCompany registry key.

Command #2

New-Itemproperty -Path "HKLM:\Software\MyCompany" -name NewProperty -value NewPropertyValue 

Press return

We just added the name NewProperty to the registry.

Now we need to add a new value of 400 employees to my company.

Command #3

New-itemproperty -path HKLM:\Software\MyCompany -name NoOfEmployees -value 400

       Press return

And there is our employee values of 400.

Let’s take a look at the results by taking a look at the windows registry editor.

  • From the search bar type registry
  • From HKLM, follow the path software\MyCompany
  • Click MyCompany

              And there is our registry key and our entries.

Now let’s take a look at the results by using the get-itemproperty cmdlet.

Type CLS – Press return

Command #4

       Get-itemproperty hklm:\software\mycompany

       Press return

       And you can see all our entries.

Now we will remove the registry value NewProperty that we created using Command #2

Command#5

        Remove-Itemproperty -Path "HKLM:\Software\MyCompany" -name NewProperty 

        Press return

  • Now run Command #4 again and notice that the NewProperty value has been removed.

Now we will remove the MyCompany registry entry by using the cmdlet remove-item

Command #6

          Remove-Item -Path "HKLM:\Software\MyCompany" 

          Press return

Rerun Command #4 and you will see that MyCompany has been removed.

  Path cmdlets

Now let’s checkout several of the path cmdlets

  • Test-Path - Determines whether all elements of the path exist. This cmdlet is handy if you are writing a script and you want to test whether the path to a file is true or false. Test path can save you a lot of time.

For Example: Perhaps you need to check to see if the password log is present in the debug directory.

Command #7

      Test-Path 'C:\windows\debug\PASSWD.LOG'

       Press return

       The cmdlet returns true, so we know that passwd.log file is in that folder.

Now let’s check out the Resolve-path cmdlet

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