Invoke-Command in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a command on a remote computer named 'Server01'.

PowerShell

Invoke-Command -ComputerName [1] -ScriptBlock { Get-Process }

Drag options to blanks, or click blank then click option'

AServer01

BLocalHost

CRemotePC

DMyComputer

Attempts:

3 left

💡 Hint

Common Mistakes

Using the local computer name instead of the remote computer name.

Leaving the -ComputerName parameter empty.

The -ComputerName parameter specifies the remote computer to run the command on. 'Server01' is the correct remote computer name.

2fill in blank

medium

Complete the code to run the command 'Get-Service' on the remote computer 'Server02'.

PowerShell

Invoke-Command -ComputerName Server02 -ScriptBlock { [1] }

Drag options to blanks, or click blank then click option'

AGet-Process

BStart-Service

CStop-Service

DGet-Service

Attempts:

3 left

💡 Hint

Common Mistakes

Using a command unrelated to services.

Forgetting to put the command inside the script block.

The script block should contain the command you want to run remotely. 'Get-Service' lists services on the remote computer.

3fill in blank

hard

Fix the error in the code to correctly run 'Get-EventLog' on 'Server03'.

PowerShell

Invoke-Command -ComputerName Server03 -ScriptBlock [1]

Drag options to blanks, or click blank then click option'

A{ Get-EventLog -LogName System }

BGet-EventLog -LogName System

C[Get-EventLog -LogName System]

D(Get-EventLog -LogName System)

Attempts:

3 left

💡 Hint

Common Mistakes

Not using curly braces for the script block.

Using parentheses or square brackets instead of curly braces.

The script block must be enclosed in curly braces {} to run commands remotely.

4fill in blank

hard

Fill both blanks to run 'Get-Process' on 'Server04' and store the result in a variable.

PowerShell

$processes = Invoke-Command -ComputerName [1] -ScriptBlock [2]

Drag options to blanks, or click blank then click option'

AServer04

B{ Get-Process }

CServer05

D{ Get-Service }

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up computer names.

Not using curly braces for the script block.

The -ComputerName should be 'Server04' and the script block should contain '{ Get-Process }' to run the command remotely.

5fill in blank

hard

Fill all three blanks to run 'Get-Service' on 'Server06' and filter services with status 'Running'.

PowerShell

$runningServices = Invoke-Command -ComputerName [1] -ScriptBlock { Get-Service | Where-Object { $_.Status -eq '[2]' } } | Where-Object { $_.Name -like '[3]' }

Drag options to blanks, or click blank then click option'

AServer06

BRunning

C*

DStopped

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong computer name.

Using wrong status like 'Stopped' instead of 'Running'.

Not using wildcard '*' for name filter.

The command runs on 'Server06', filters services with status 'Running', and then filters names matching any pattern with '*'.

Practice

1. What is the primary purpose of the Invoke-Command cmdlet in PowerShell?

easy

A. To display system event logs

B. To run commands on remote or local computers

C. To edit files locally

D. To create new user accounts

Solution

1. Step 1: Understand the cmdlet's function

   Invoke-Command is designed to run commands remotely or locally on one or more computers.

2. Step 2: Compare options

   Options A, B, and C describe unrelated tasks like user management, file editing, or log viewing, which are not the main purpose of Invoke-Command.

3. Final Answer:

   To run commands on remote or local computers -> Option B

4. Quick Check:

   Invoke-Command runs commands remotely or locally [OK]

Hint: Invoke-Command runs scripts on other computers [OK]

Common Mistakes:

• Confusing Invoke-Command with file editing cmdlets
• Thinking it only works locally
• Assuming it manages user accounts

2. Which of the following is the correct syntax to run a script block on a remote computer named 'Server01' using Invoke-Command?

easy

A. Invoke-Command -ComputerName Server01 -ScriptBlock { Get-Process }

B. Invoke-Command Server01 -ScriptBlock Get-Process

C. Invoke-Command -ScriptBlock Server01 { Get-Process }

D. Invoke-Command -ComputerName { Server01 } -ScriptBlock Get-Process

Solution

1. Step 1: Identify correct parameter usage

   The -ComputerName parameter expects the remote computer's name, and -ScriptBlock expects a script block enclosed in braces.

2. Step 2: Validate syntax correctness

   Invoke-Command -ComputerName Server01 -ScriptBlock { Get-Process } correctly uses -ComputerName Server01 and -ScriptBlock { Get-Process }. Other options misuse parameters or omit braces.

3. Final Answer:

   Invoke-Command -ComputerName Server01 -ScriptBlock { Get-Process } -> Option A

4. Quick Check:

   Correct syntax uses -ComputerName and script block braces [OK]

Hint: Use braces {} for script block and -ComputerName for target [OK]

Common Mistakes:

• Omitting braces around script block
• Placing computer name inside braces
• Using script block without braces

3. What will be the output of this command?

Invoke-Command -ComputerName localhost -ScriptBlock { 2 + 3 }

medium

A. Error: Cannot find computer

B. 2 + 3

C. 5

D. null

Solution

1. Step 1: Understand command execution on localhost

   The command runs the script block { 2 + 3 } on the local computer named 'localhost'.

2. Step 2: Calculate the script block result

   The expression 2 + 3 evaluates to 5, so the output will be 5.

3. Final Answer:

   5 -> Option C

4. Quick Check:

   2 + 3 = 5 [OK]

Hint: Script block runs and returns result, not expression text [OK]

Common Mistakes:

• Expecting the expression as string output
• Assuming remote computer error on localhost
• Thinking output is null

4. You run this command:

Invoke-Command -ComputerName Server01 -ScriptBlock { Get-Service }

But get an error: "Access is denied." What is the most likely cause?

medium

A. The script block syntax is incorrect

B. Get-Service cmdlet does not exist

C. Server01 is offline

D. You do not have permission to run commands on Server01

Solution

1. Step 1: Analyze the error message

   "Access is denied" indicates a permissions issue, not syntax or cmdlet existence.

2. Step 2: Match error to cause

   Permission problems usually mean the user lacks rights to run remote commands on Server01.

3. Final Answer:

   You do not have permission to run commands on Server01 -> Option D

4. Quick Check:

   Access denied = permission issue [OK]

Hint: Access denied usually means permission problem [OK]

Common Mistakes:

• Assuming syntax error causes access denied
• Thinking server offline causes access denied
• Believing cmdlet absence causes access denied

5. You want to run a command on multiple remote computers: Server01, Server02, and Server03. Which command correctly runs Get-EventLog -LogName System -Newest 5 on all three at once?

hard

A. Invoke-Command -ComputerName @('Server01', 'Server02', 'Server03') -ScriptBlock { Get-EventLog -LogName System -Newest 5 }

B. Invoke-Command -ComputerName 'Server01 Server02 Server03' -ScriptBlock { Get-EventLog -LogName System -Newest 5 }

C. Invoke-Command -ComputerName Server01 Server02 Server03 -ScriptBlock { Get-EventLog -LogName System -Newest 5 }

D. Invoke-Command -ComputerName Server01; Server02; Server03 -ScriptBlock { Get-EventLog -LogName System -Newest 5 }

Solution

1. Step 1: Understand how to specify multiple computers

   The -ComputerName parameter accepts an array of strings to target multiple computers.

2. Step 2: Evaluate options for correct array syntax

   Invoke-Command -ComputerName @('Server01', 'Server02', 'Server03') -ScriptBlock { Get-EventLog -LogName System -Newest 5 } uses an array @('Server01', 'Server02', 'Server03'), which is the correct way to pass multiple names. Invoke-Command -ComputerName Server01 Server02 Server03 -ScriptBlock { Get-EventLog -LogName System -Newest 5 } uses space-separated names without commas or array syntax, which is invalid. Invoke-Command -ComputerName 'Server01 Server02 Server03' -ScriptBlock { Get-EventLog -LogName System -Newest 5 } passes a single string with spaces, treated as one name. Invoke-Command -ComputerName Server01; Server02; Server03 -ScriptBlock { Get-EventLog -LogName System -Newest 5 } uses semicolons, which is invalid syntax.

3. Final Answer:

   Invoke-Command -ComputerName @('Server01', 'Server02', 'Server03') -ScriptBlock { Get-EventLog -LogName System -Newest 5 } -> Option A

4. Quick Check:

   Use array syntax @() for multiple computers [OK]

Hint: Use @() array for multiple computer names [OK]

Common Mistakes:

• Using space-separated names without commas or array syntax
• Passing all names as one string
• Using semicolons to separate names