First PowerShell command - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this PowerShell command?

Consider the following PowerShell command:

Write-Output "Hello, World!"

What will this command display in the console?

PowerShell

Write-Output "Hello, World!"

A Nothing is displayed

B Write-Output "Hello, World!"

C Error: Command not found

D Hello, World!

💡 Hint

Write-Output sends the text to the console.

The Write-Output command prints the string to the console exactly as given.

💻 Command Output

intermediate

What does this PowerShell command output?

Look at this command:

Get-Date -Format "yyyy-MM-dd"

What kind of output will it produce?

PowerShell

Get-Date -Format "yyyy-MM-dd"

A The current time in format like 14:30:00

B An error about invalid format

C The current date in format like 2024-06-15

D The full date and time in default format

💡 Hint

The -Format parameter controls how the date is shown.

Get-Date with -Format "yyyy-MM-dd" outputs only the date in year-month-day format.

📝 Syntax

advanced

Which PowerShell command correctly assigns a string to a variable?

You want to store the text "Hello" in a variable named greeting. Which command is correct?

A $greeting = Hello

B $greeting = "Hello"

C greeting = "Hello"

D $greeting := "Hello"

💡 Hint

Strings need quotes and variables start with $ in PowerShell.

In PowerShell, variables start with $, and strings must be in quotes.

🔧 Debug

advanced

What error does this PowerShell command produce?

Examine this command:

Write-Output Hello World

What happens when you run it?

A Outputs: Hello World

B Outputs: Hello

C Outputs: HelloWorld

D Error: Missing quotation marks

💡 Hint

Write-Output can take multiple arguments separated by spaces.

Write-Output outputs all arguments separated by spaces, so it prints Hello World.

🚀 Application

expert

How many items does this PowerShell command output?

Consider this command:

1..5 | ForEach-Object { $_ * 2 }

How many numbers will be output?

PowerShell

1..5 | ForEach-Object { $_ * 2 }

A 5

B 1

C 0

D 10

💡 Hint

1..5 creates a list of 5 numbers, each doubled.

The command processes numbers 1 to 5, doubling each, so outputs 5 numbers.

Practice

1. What does the PowerShell command Write-Output "Hello, World!" do?

easy

A. It opens a new PowerShell window.

B. It saves the text to a file automatically.

C. It displays the text "Hello, World!" on the screen.

D. It deletes the text from the screen.

Solution

1. Step 1: Understand Write-Output command

   The Write-Output command sends the specified text or data to the screen or pipeline.

2. Step 2: Analyze the given command

   The command Write-Output "Hello, World!" prints the text "Hello, World!" on the screen.

3. Final Answer:

   It displays the text "Hello, World!" on the screen. -> Option C

4. Quick Check:

   Write-Output prints text = D [OK]

Hint: Write-Output prints text to screen or pipeline [OK]

Common Mistakes:

• Thinking it saves text to a file automatically
• Confusing output with deleting or opening windows
• Assuming it runs scripts instead of showing text

2. Which of the following is the correct syntax to display the number 123 in PowerShell?

easy

A. Write-Output "123"

B. Write-Output 123

C. Write-Output (123)

D. Write-Output [123]

Solution

1. Step 1: Check syntax for Write-Output with numbers

   Write-Output can print numbers directly without quotes or brackets.

2. Step 2: Evaluate each option

   Write-Output 123 uses Write-Output 123 which is correct syntax to print number 123.

3. Final Answer:

   Write-Output 123 -> Option B

4. Quick Check:

   Number without quotes prints correctly = B [OK]

Hint: Numbers print without quotes in Write-Output [OK]

Common Mistakes:

• Putting numbers inside brackets or square brackets
• Using quotes unnecessarily for numbers
• Confusing parentheses as required syntax

3. What will be the output of this PowerShell command?

Write-Output (5 + 3)

medium

A. 8

B. 5 + 3

C. (5 + 3)

D. Write-Output (5 + 3)

Solution

1. Step 1: Understand expression evaluation in Write-Output

   Parentheses cause the expression inside to be evaluated before output.

2. Step 2: Calculate the expression (5 + 3)

   5 + 3 equals 8, so Write-Output prints 8.

3. Final Answer:

   8 -> Option A

4. Quick Check:

   Write-Output evaluates expressions = A [OK]

Hint: Parentheses evaluate expressions before printing [OK]

Common Mistakes:

• Thinking it prints the expression as text
• Confusing output with command text
• Ignoring parentheses effect on evaluation

4. Identify the error in this PowerShell command:

Write-Output Hello World

medium

A. Missing quotes around text with spaces

B. Write-Output cannot print text

C. Command should be lowercase

D. No error, command is correct

Solution

1. Step 1: Check syntax for strings with spaces

   Text with spaces must be enclosed in quotes to be treated as one string.

2. Step 2: Analyze given command

   Write-Output Hello World treats Hello and World as separate arguments causing error or unexpected output.

3. Final Answer:

   Missing quotes around text with spaces -> Option A

4. Quick Check:

   Text with spaces needs quotes = C [OK]

Hint: Put quotes around multi-word text in Write-Output [OK]

Common Mistakes:

• Assuming Write-Output can't print text
• Ignoring quotes for multi-word strings
• Thinking command case matters in PowerShell

5. You want to print the result of adding two numbers, 7 and 4, using a single PowerShell command. Which command should you use?

hard

A. Write-Output 7, 4

B. Write-Output "7 + 4"

C. Write-Output 7 4

D. Write-Output (7 + 4)

Solution

1. Step 1: Understand how to calculate expressions in Write-Output

   Using parentheses causes PowerShell to evaluate the expression before printing.

2. Step 2: Evaluate each option

   Write-Output (7 + 4) uses Write-Output (7 + 4), which calculates 11 and prints it.

3. Final Answer:

   Write-Output (7 + 4) -> Option D

4. Quick Check:

   Parentheses evaluate math before output = A [OK]

Hint: Use parentheses to calculate before printing [OK]

Common Mistakes:

• Putting math inside quotes prints text, not result
• Writing multiple arguments without parentheses
• Using commas prints array, not sum