CIM/WMI cmdlets in PowerShell - Mini Project: Build & Apply

Using CIM/WMI Cmdlets in PowerShell

📖 Scenario: You are a system administrator who wants to gather information about the computer's operating system using PowerShell. You will use CIM/WMI cmdlets to query system details.

🎯 Goal: Build a PowerShell script that retrieves the operating system's caption and version using CIM/WMI cmdlets and displays the information.

📋 What You'll Learn

Create a variable with the CIM class name for the operating system

Create a variable to store the property names to retrieve

Use Get-CimInstance with the class name to get OS info

Select only the specified properties from the CIM instance

Display the operating system caption and version

💡 Why This Matters

🌍 Real World

System administrators often need to gather system information remotely or locally to manage computers efficiently. CIM/WMI cmdlets provide a powerful way to query this data.

💼 Career

Knowing how to use CIM/WMI cmdlets is essential for IT professionals and system administrators to automate system monitoring and reporting tasks.

1

Set CIM class name variable

Create a variable called $cimClass and set it to the string 'Win32_OperatingSystem'.

PowerShell

# Create a variable called $cimClass and set it to 'Win32_OperatingSystem'
# Your code here

Hint

The CIM class for operating system info is Win32_OperatingSystem.

2

Set properties to retrieve

Create a variable called $properties and set it to an array containing the strings 'Caption' and 'Version'.

PowerShell

$cimClass = 'Win32_OperatingSystem'
# Create a variable called $properties with 'Caption' and 'Version'
# Your code here

Hint

Use an array with @('Caption', 'Version') to list the properties.

3

Retrieve OS information using Get-CimInstance

Use Get-CimInstance with the class name stored in $cimClass and store the result in a variable called $osInfo. Then select only the properties in $properties from $osInfo.

PowerShell

$cimClass = 'Win32_OperatingSystem'
$properties = @('Caption', 'Version')
# Use Get-CimInstance with $cimClass and select $properties
# Your code here

Hint

Use Get-CimInstance -ClassName $cimClass and pipe to Select-Object -Property $properties.

4

Display the operating system information

Write a Write-Output statement to display the operating system caption and version from $osInfo in the format: Operating System: [Caption], Version: [Version].

PowerShell

$cimClass = 'Win32_OperatingSystem'
$properties = @('Caption', 'Version')
$osInfo = Get-CimInstance -ClassName $cimClass | Select-Object -Property $properties
# Display the OS caption and version
# Your code here

Hint

Use Write-Output with string interpolation to show the caption and version.

Practice

1. What does the PowerShell cmdlet Get-CimInstance do?

easy

A. Starts a new PowerShell session.

B. Retrieves management information from local or remote computers using CIM.

C. Deletes files from the system.

D. Installs software packages.

Solution

1. Step 1: Understand the purpose of Get-CimInstance

   Get-CimInstance is used to get management data from computers, like hardware or software info.

2. Step 2: Compare options with cmdlet purpose

   Only Retrieves management information from local or remote computers using CIM. describes retrieving management info, matching the cmdlet's function.

3. Final Answer:

   Retrieves management information from local or remote computers using CIM. -> Option B

4. Quick Check:

   Get-CimInstance = Retrieves info [OK]

Hint: Get-CimInstance fetches system info, not file or session tasks [OK]

Common Mistakes:

• Confusing Get-CimInstance with file or session commands
• Thinking it installs software
• Assuming it deletes files

2. Which of the following is the correct syntax to get the list of running processes using CIM cmdlets?

easy

A. Get-CimInstance -ClassName Win32_Process

B. Get-CimInstance Win32_Process

C. Get-WmiObject -Class Win32_Process

D. Get-Process -ClassName Win32_Process

Solution

1. Step 1: Identify correct syntax for Get-CimInstance

   The correct parameter to specify the class is -ClassName, so Get-CimInstance -ClassName Win32_Process is valid.

2. Step 2: Check other options for syntax errors

   Get-CimInstance Win32_Process misses the parameter name, Get-WmiObject -Class Win32_Process uses Get-WmiObject (older cmdlet), and Get-Process -ClassName Win32_Process uses Get-Process incorrectly with a class parameter.

3. Final Answer:

   Get-CimInstance -ClassName Win32_Process -> Option A

4. Quick Check:

   Correct syntax uses -ClassName parameter [OK]

Hint: Use -ClassName to specify CIM class in Get-CimInstance [OK]

Common Mistakes:

• Omitting -ClassName parameter
• Mixing Get-CimInstance with Get-WmiObject syntax
• Using Get-Process with CIM class names

3. What will be the output of this command?

Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object -Property Caption

medium

A. A list of running processes.

B. The computer's network adapter details.

C. An error about invalid property.

D. The name of the operating system installed on the computer.

Solution

1. Step 1: Understand the CIM class and property

   The class Win32_OperatingSystem contains OS info; the property Caption holds the OS name.

2. Step 2: Analyze the command output

   Selecting Caption will output the OS name, not processes or network info, and no error occurs.

3. Final Answer:

   The name of the operating system installed on the computer. -> Option D

4. Quick Check:

   Win32_OperatingSystem Caption = OS name [OK]

Hint: Win32_OperatingSystem class holds OS info; Caption is OS name [OK]

Common Mistakes:

• Confusing OS info with process or network info
• Expecting full object instead of selected property
• Assuming property Caption does not exist

4. You run this command but get an error:

Get-CimInstance -Class Win32_Processor

What is the likely cause?

medium

A. The parameter name should be -ClassName, not -Class.

B. Win32_Processor is not a valid CIM class.

C. Get-CimInstance cannot query processor info.

D. You need administrator rights to run this command.

Solution

1. Step 1: Check the parameter name used

   The correct parameter for specifying the class in Get-CimInstance is -ClassName, not -Class.

2. Step 2: Verify class validity and permissions

   Win32_Processor is a valid class and Get-CimInstance can query it; admin rights are usually not required for this query.

3. Final Answer:

   The parameter name should be -ClassName, not -Class. -> Option A

4. Quick Check:

   Use -ClassName parameter with Get-CimInstance [OK]

Hint: Use -ClassName, not -Class, with Get-CimInstance [OK]

Common Mistakes:

• Using -Class instead of -ClassName
• Assuming class is invalid
• Thinking admin rights are needed

5. You want to list all services that are currently running on a remote computer named 'Server01' using CIM cmdlets. Which command is correct?

hard

A. Get-CimInstance -ClassName Win32_Service -ComputerName Server01 | Where-Object { $_.Status -eq 'Running' }

B. Get-WmiObject -Class Win32_Service -ComputerName Server01 | Where-Object { $_.Status -eq 'Running' }

C. Get-CimInstance -ClassName Win32_Service -ComputerName Server01 | Where-Object { $_.State -eq 'Running' }

D. Get-CimInstance -ClassName Win32_Service -ComputerName Server01 | Where-Object { $_.State -eq 'Stopped' }

Solution

1. Step 1: Identify the correct property for running services

   The property State with value 'Running' correctly filters running services in Win32_Service.

2. Step 2: Choose the correct cmdlet and filter

   Using Get-CimInstance with -ComputerName is modern and correct. Filtering with Where-Object { $_.State -eq 'Running' } matches running services.

3. Final Answer:

   Get-CimInstance -ClassName Win32_Service -ComputerName Server01 | Where-Object { $_.State -eq 'Running' } -> Option C

4. Quick Check:

   Filter by State='Running' with Get-CimInstance [OK]

Hint: Filter services by State='Running' using Get-CimInstance [OK]

Common Mistakes:

• Using Status instead of State property
• Filtering for 'Stopped' instead of 'Running'
• Mixing Get-WmiObject with CIM cmdlets