PowerShell versions (5.1 vs 7+) - Visual Side-by-Side Comparison

Concept Flow - PowerShell versions (5.1 vs 7+)

Start PowerShell

↓

Check Version

↓

Version 5.1

↓

Windows-only

↓

Legacy Cmdlets

↓

End

PowerShell starts, checks its version, then follows different paths for version 5.1 (Windows-only) or 7+ (cross-platform with new features).

Execution Sample

PowerShell

Write-Host "PowerShell Version:" $PSVersionTable.PSVersion
if ($PSVersionTable.PSVersion.Major -ge 7) {
  Write-Host "You are using PowerShell 7 or newer."
} else {
  Write-Host "You are using PowerShell 5.1 or older."
}

This script prints the PowerShell version and tells if it's version 7+ or 5.1 or older.

Execution Table

Step	Action	Evaluation	Output
1	Print PowerShell version	$PSVersionTable.PSVersion = 7.2.1	PowerShell Version: 7.2.1
2	Check if Major version >= 7	7 >= 7 is True	You are using PowerShell 7 or newer.
3	End script	-	-

💡 Script ends after printing version info and message based on version check.

Variable Tracker

Variable	Start	After Step 1	After Step 2	Final
$PSVersionTable.PSVersion	N/A	7.2.1	7.2.1	7.2.1
$PSVersionTable.PSVersion.Major	N/A	7	7	7

Key Moments - 2 Insights

Why does the script check only the Major version number?

Because the Major version (like 5 or 7) tells us the big difference in features and compatibility, as shown in the execution_table step 2 where we compare Major version to 7.

Can PowerShell 7+ run on non-Windows systems?

Yes, PowerShell 7+ is cross-platform, unlike 5.1 which is Windows-only, as shown in the concept_flow branches.

Visual Quiz - 3 Questions

Look at the execution_table step 2, what is the Major version number used in the comparison?

A 5

B 7

C 2

D 1

💡 Hint

Check the 'Evaluation' column in step 2 of the execution_table.

At which step does the script decide which PowerShell version message to print?

A Step 1

B Step 3

C Step 2

D No decision is made

💡 Hint

Look at the 'Action' and 'Output' columns in the execution_table.

If the Major version was 5, what would the output be at step 2?

A "You are using PowerShell 5.1 or older."

B "You are using PowerShell 7 or newer."

C "PowerShell Version: 5.1"

D No output

💡 Hint

Refer to the if-else logic in the execution_sample code and the execution_table outputs.

Concept Snapshot

PowerShell versions differ mainly by Major version number.
Version 5.1 is Windows-only; 7+ is cross-platform.
Check $PSVersionTable.PSVersion.Major to detect version.
Use version check to run version-specific code.
PowerShell 7+ has new features and better performance.

Full Transcript

This lesson shows how PowerShell versions 5.1 and 7+ differ. The script prints the current PowerShell version and checks the Major version number. If the Major version is 7 or higher, it prints a message saying you are using PowerShell 7 or newer. Otherwise, it says you are using PowerShell 5.1 or older. Version 5.1 runs only on Windows, while 7+ works on Windows, Linux, and macOS. This helps you write scripts that behave correctly depending on the PowerShell version.

Practice

1. Which statement correctly describes PowerShell 5.1 compared to PowerShell 7+?

easy

A. PowerShell 7+ is only available on Linux systems.

B. PowerShell 5.1 is Windows-only and comes pre-installed on many Windows PCs.

C. PowerShell 5.1 is cross-platform and faster than PowerShell 7+.

D. PowerShell 7+ is the older version and no longer supported.

Solution

1. Step 1: Understand PowerShell 5.1 platform support

   PowerShell 5.1 is built for Windows and comes pre-installed on many Windows machines.

2. Step 2: Compare with PowerShell 7+

   PowerShell 7+ is newer, faster, and supports Windows, Mac, and Linux.

3. Final Answer:

   PowerShell 5.1 is Windows-only and comes pre-installed on many Windows PCs. -> Option B

4. Quick Check:

   PowerShell 5.1 = Windows-only [OK]

Hint: Remember: 5.1 = Windows-only, 7+ = cross-platform [OK]

Common Mistakes:

• Thinking PowerShell 5.1 works on Mac/Linux
• Confusing which version is newer
• Assuming PowerShell 7+ is Windows-only

2. Which of the following is the correct PowerShell command to check your PowerShell version?

easy

A. $PSVersionTable.PSVersion

B. Get-PSVersion

C. Check-PSVersion

D. Show-Version

Solution

1. Step 1: Recall the built-in variable for version info

   $PSVersionTable is a built-in variable that holds version details.

2. Step 2: Access the PSVersion property

   Using $PSVersionTable.PSVersion returns the current PowerShell version object.

3. Final Answer:

   $PSVersionTable.PSVersion -> Option A

4. Quick Check:

   Check version = $PSVersionTable.PSVersion [OK]

Hint: Use $PSVersionTable.PSVersion to see your PowerShell version [OK]

Common Mistakes:

• Using non-existent commands like Get-PSVersion
• Confusing variable names
• Trying commands that don't exist in PowerShell

3. What will be the output of this command in PowerShell 7+?

$PSVersionTable.PSVersion.Major

medium

A. 5

B. Error: Property not found

C. 1

D. 7

Solution

1. Step 1: Understand the command

   $PSVersionTable.PSVersion returns a version object; .Major accesses the major version number.

2. Step 2: Identify the major version in PowerShell 7+

   PowerShell 7+ means the major version is 7, so the output is 7.

3. Final Answer:

   7 -> Option D

4. Quick Check:

   Major version in PS 7+ = 7 [OK]

Hint: Major version number is the first digit in $PSVersionTable.PSVersion [OK]

Common Mistakes:

• Assuming major version is 5 for PowerShell 7+
• Expecting full version string instead of major number
• Thinking .Major property does not exist

4. You run this script in PowerShell 5.1:

if ($PSVersionTable.PSVersion.Major -ge 7) { Write-Output "New version" } else { Write-Output "Old version" }

But it always outputs "Old version" even on PowerShell 7+. What is the likely problem?

medium

A. The script is running in PowerShell 5.1, not 7+.

B. The comparison operator -ge is invalid in PowerShell 5.1.

C. $PSVersionTable.PSVersion does not exist in PowerShell 5.1.

D. Write-Output cannot print strings in PowerShell 7+.

Solution

1. Step 1: Analyze the condition logic

   The script checks if major version is 7 or greater to print "New version".

2. Step 2: Understand why it outputs "Old version"

   If it always prints "Old version", the major version is less than 7, meaning the script runs in PowerShell 5.1 or older.

3. Final Answer:

   The script is running in PowerShell 5.1, not 7+. -> Option A

4. Quick Check:

   Output "Old version" means PS version < 7 [OK]

Hint: If condition fails, check which PowerShell version runs the script [OK]

Common Mistakes:

• Thinking -ge operator is invalid in 5.1
• Assuming $PSVersionTable.PSVersion is missing in 5.1
• Believing Write-Output behaves differently in 7+

5. You want to write a script that uses a feature only available in PowerShell 7+, but your script might run on 5.1. How should you check the version before running the feature?

hard

A. Use if ($PSVersionTable.PSVersion -eq 7) { # run feature }

B. Use if ($PSVersionTable.Version -gt 7) { # run feature }

C. Use if ($PSVersionTable.PSVersion.Major -ge 7) { # run feature }

D. Use if ($PSVersionTable.PSVersion.Minor -ge 7) { # run feature }

Solution

1. Step 1: Identify correct property for major version

   $PSVersionTable.PSVersion.Major gives the major version number (5 or 7).

2. Step 2: Use proper comparison operator

   Using -ge 7 checks if version is 7 or higher, suitable for feature gating.

3. Final Answer:

   Use if ($PSVersionTable.PSVersion.Major -ge 7) { # run feature } -> Option C

4. Quick Check:

   Check major version with .Major and -ge 7 [OK]

Hint: Check major version with .Major and -ge 7 before running features [OK]

Common Mistakes:

• Comparing full version object instead of .Major
• Using .Minor instead of .Major for major version check
• Using wrong property like $PSVersionTable.Version