Registry operations in PowerShell - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this PowerShell command?

Given the following command, what will it output if the registry key HKCU:\Software\MyApp contains a string value Version set to 1.2.3?

PowerShell

Get-ItemProperty -Path 'HKCU:\Software\MyApp' -Name Version | Select-Object -ExpandProperty Version

A HKCU:\Software\MyApp

B Version

C 1.2.3

D Get-ItemProperty

💡 Hint

The command extracts the value of the property named 'Version' from the registry key.

The command gets the property 'Version' from the specified registry path and expands it to output only its value, which is '1.2.3'.

📝 Syntax

intermediate

Which option correctly creates a new registry key?

You want to create a new registry key HKCU:\Software\MyApp\Settings. Which command is syntactically correct?

A New-ItemProperty -Path 'HKCU:\Software\MyApp\Settings'

B New-RegistryKey -Path 'HKCU:\Software\MyApp\Settings'

C Create-Item -Path 'HKCU:\Software\MyApp\Settings'

D New-Item -Path 'HKCU:\Software\MyApp\Settings'

💡 Hint

The cmdlet to create a new registry key is similar to creating a new item in a provider path.

The correct cmdlet to create a new registry key is New-Item with the registry path. Other options are invalid or used for different purposes.

🔧 Debug

advanced

Why does this script fail to set a registry value?

This script tries to set a string value Theme to Dark under HKCU:\Software\MyApp but fails with an error. What is the cause?

Set-ItemProperty -Path 'HKCU:\Software\MyApp' -Name Theme -Value Dark

A The -Value parameter requires a string in quotes.

B The registry key 'HKCU:\Software\MyApp' does not exist.

C Set-ItemProperty cannot set string values.

D The -Name parameter should be omitted.

💡 Hint

Check if the registry key exists before setting a property.

If the registry key does not exist, Set-ItemProperty will fail because it cannot set a property on a non-existent key.

🚀 Application

advanced

How to delete a registry value safely?

You want to delete the registry value Theme under HKCU:\Software\MyApp only if it exists. Which script snippet correctly does this?

A Remove-ItemProperty -Path 'HKCU:\Software\MyApp' -Name Theme -ErrorAction SilentlyContinue

B Remove-ItemProperty -Path 'HKCU:\Software\MyApp' -Name Theme

C Remove-ItemProperty -Path 'HKCU:\Software\MyApp' -Name Theme -Force

D Remove-Item -Path 'HKCU:\Software\MyApp\Theme'

💡 Hint

Use error handling to avoid errors if the value does not exist.

Option A deletes the value and suppresses errors if the value is missing, making it safe to run.

🧠 Conceptual

expert

What is the effect of this PowerShell script on the registry?

Consider this script:

$keyPath = 'HKCU:\Software\MyApp'
if (-not (Test-Path $keyPath)) {
  New-Item -Path $keyPath | Out-Null
}
Set-ItemProperty -Path $keyPath -Name 'LastRun' -Value (Get-Date).ToString('yyyy-MM-dd')

What does this script do?

A Creates the key if missing and sets 'LastRun' value to today's date in yyyy-MM-dd format.

B Deletes the key if it exists and sets 'LastRun' value to current time.

C Only sets 'LastRun' value without creating the key if missing.

D Creates a new key every time without setting any value.

💡 Hint

Check the logic: it tests for key existence, creates if missing, then sets a value.

The script ensures the registry key exists, then sets a string value 'LastRun' with the current date formatted as yyyy-MM-dd.