Variable creation with $ in PowerShell - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the $ symbol mean in PowerShell?

The $ symbol is used to create or reference a variable in PowerShell. It tells the shell that what follows is a variable name.

beginner

How do you create a variable named 'name' with the value 'Alice' in PowerShell?

You write: $name = "Alice". This assigns the text 'Alice' to the variable $name.

beginner

Can you use a variable without the $ symbol in PowerShell?

No. In PowerShell, you must use the $ symbol to access or create variables. Without it, PowerShell treats the word as a command or string.

beginner

What happens if you write $number = 5 in PowerShell?

You create a variable named $number and store the number 5 in it. You can use $number later to get the value 5.

beginner

How do you display the value of a variable in PowerShell?

Simply type the variable name with the $ symbol, like $name, and PowerShell will show its value.

What does $var = 10 do in PowerShell?

A Creates a variable named var with value 10

B Deletes the variable var

C Prints 10 to the screen

D Creates a function named var

The $ symbol creates a variable. $var = 10 assigns the value 10 to the variable var.

How do you access the value stored in a variable named 'score'?

A &score

B score

C $score

D #score

In PowerShell, you use $ before the variable name to access its value.

Which of these is a valid variable name in PowerShell?

A $first_place

B $-score

C $1stPlace

D $score!

Variable names can include letters, numbers (not at start), and underscores. $first_place is valid.

What will PowerShell do if you type $greeting without assigning it first?

A Show an error

B Show an empty string

C Show the variable name

D Show nothing

Unassigned variables in PowerShell return an empty string when accessed.

Which symbol is used to create variables in PowerShell?

A %

B #

C &

D $

The $ symbol is used to create and reference variables in PowerShell.

Explain how to create and use a variable in PowerShell with an example.

Think about how you store and then use a label for a value.

What rules should you remember about variable names and usage in PowerShell?

Consider what characters are allowed and how to call variables.

Practice

1. What does the $ symbol do in PowerShell when placed before a word like $name?

easy

A. It prints the word 'name' to the screen.

B. It creates a variable named 'name' to store data.

C. It comments out the line.

D. It runs a command called 'name'.

Solution

1. Step 1: Understand the role of $ in PowerShell

   The $ symbol is used to declare or access variables in PowerShell.

2. Step 2: Identify what $name means

   $name means a variable named 'name' that can hold data like text or numbers.

3. Final Answer:

   It creates a variable named 'name' to store data. -> Option B

4. Quick Check:

   $ before word = variable creation [OK]

Hint: Remember: $ always starts a variable name [OK]

Common Mistakes:

• Thinking $ runs commands
• Confusing $ with comments
• Assuming $ prints text directly

2. Which of the following is the correct way to create a variable named age with the value 30 in PowerShell?

easy

A. $age = 30

B. set age = 30

C. age = 30

D. var $age = 30

Solution

1. Step 1: Recall PowerShell variable syntax

   Variables start with $ and assignment uses =.

2. Step 2: Check each option

   $age = 30 uses $age = 30, which is correct syntax for variable creation and assignment.

3. Final Answer:

   $age = 30 -> Option A

4. Quick Check:

   Variable = $name = value [OK]

Hint: Always start variable names with $ in PowerShell [OK]

Common Mistakes:

• Omitting the $ before variable name
• Using 'set' keyword which is not PowerShell syntax
• Adding 'var' keyword which is not used in PowerShell

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

$greeting = "Hello"
$name = "Sam"
Write-Output "$greeting, $name!"

medium

A. Error: Variable not defined

B. $greeting, $name!

C. Hello $name!

D. Hello, Sam!

Solution

1. Step 1: Understand variable assignment

   $greeting is assigned "Hello" and $name is assigned "Sam".

2. Step 2: Understand string interpolation in double quotes

   Inside double quotes, variables like $greeting and $name are replaced by their values.

3. Final Answer:

   Hello, Sam! -> Option D

4. Quick Check:

   Variables inside "" show their values [OK]

Hint: Use double quotes to insert variables inside strings [OK]

Common Mistakes:

• Using single quotes which do not expand variables
• Expecting variable names to print literally
• Forgetting to assign variables before use

4. Identify the error in this PowerShell script:

$number = 10
$number = $number + 5
Write-Output number

medium

A. Cannot add numbers in PowerShell

B. Variable $number not declared

C. Missing $ before 'number' in Write-Output

D. Write-Output cannot print variables

Solution

1. Step 1: Check variable usage in Write-Output

   The script tries to print 'number' without $, so it prints the word literally.

2. Step 2: Correct usage of variable in output

   To print the variable value, it should be Write-Output $number.

3. Final Answer:

   Missing $ before 'number' in Write-Output -> Option C

4. Quick Check:

   Variables need $ to be recognized [OK]

Hint: Always use $ before variable names when printing [OK]

Common Mistakes:

• Forgetting $ before variable in output
• Thinking variables need declaration keyword
• Assuming Write-Output can't print variables

5. You want to create a variable $fullName by combining two variables $firstName and $lastName with a space in between. Which code correctly does this in PowerShell?

hard

A. $fullName = $firstName + " " + $lastName

B. $fullName = '$firstName $lastName'

C. $fullName = $firstName $lastName

D. $fullName = "$firstName$lastName"

Solution

1. Step 1: Understand string concatenation in PowerShell

   Use + to join strings and include a space as " ".

2. Step 2: Analyze each option

   $fullName = $firstName + " " + $lastName correctly adds $firstName, a space, and $lastName to form full name.

3. Final Answer:

   $fullName = $firstName + " " + $lastName -> Option A

4. Quick Check:

   Use + and " " to join variables with space [OK]

Hint: Use + and " " to join variables with space [OK]

Common Mistakes:

• Using single quotes which do not expand variables
• Missing operator between variables
• Concatenating without space when needed