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November 2011 - Power Tips

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  • Scanning Registry for ClassIDs

    The Windows Registry is a repository filled with various Windows settings. Get-ItemProperty can read Registry values and accepts wildcards. So, with Get-ItemProperty, you can create tools to find and extract Registry information. For example, if you know...

  • Creating PowerShell Menus

    PowerShell is console based, so its default menus are console based as well. To offer choices to your users, here is some sample code to create a simple menu: $title = "Reboot System Now" $message = "Do you want to reboot your machine now...

  • Using Wildcards with Environment Variables

    You can use the env: PowerShell drive to list all Windows environment variables like this: PS > Dir env : * user * Name Value ---- ----- USERNAME w7-pc9 USERPROFILE C:\Users\w7-pc9 ALLUSERSPROFILE C:\ProgramData USERDOMAIN DEMO5 To access the content...

  • Permanently Changing User Environment Variables

    To create or change an environment variable in the user context, use this low-level call: [ environment ] :: SetEnvironmentVariable ( ' Test ' , 12 , ' User ' ) This environment variable will keep the value until you change it or delete...

  • Using Regular Expressions with Dir

    When you use Dir (alias: Get-ChildItem) to list folder contents, you can use simple wildcards but they do not give you much control. A much more powerful approach is to use regular expressions. Since Get-ChildItem does not support regular expressions...

  • Formatting Currencies

    Formatting numbers as currencies is straight-forward - as long as it is your own currency format: ' {0:C} ' -f 12.22 If you want to output currencies in other cultures, you still can do it. Let's assume you created a currency converter and...

  • Closing Excel Gracefully

    When you access Microsoft Excel from script, you may have noticed that it never gets removed from memory again, even if you call its Quit() method: ' Excel processes: {0} ' -f @ ( Get-Process excel -ea 0 ) . Count $excel = New-Object -ComObject...
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