PowerShell versions (5.1 vs 7+) - When to Use Which

The Big Idea

What if one script could run perfectly on any computer, old or new, without changes?

The Scenario

Imagine you need to run scripts on different computers, some with older Windows systems and others with newer setups. You try to use the same commands everywhere, but they don't always work as expected.

The Problem

Using only the old PowerShell 5.1 means missing out on faster performance and new features. Scripts can break on newer systems or when using modern tools. Manually checking each system and rewriting scripts wastes time and causes frustration.

The Solution

PowerShell 7+ is a modern, cross-platform version that works on Windows, Mac, and Linux. It supports new commands and runs scripts faster. Knowing the differences helps you write scripts that work everywhere without headaches.

Before vs After

✗ Before

if ($PSVersionTable.PSVersion.Major -eq 5) { Write-Host 'Old PowerShell' }

✓ After

if ($PSVersionTable.PSVersion.Major -ge 7) { Write-Host 'Modern PowerShell' }

What It Enables

You can create powerful, reliable scripts that run smoothly on any system, saving time and avoiding errors.

Real Life Example

A system admin automates software installs on both old Windows 10 machines and new Linux servers using one script that adapts to the PowerShell version automatically.

Key Takeaways

Old PowerShell (5.1) is limited to Windows and fewer features.

PowerShell 7+ is faster, cross-platform, and supports modern scripting.

Knowing versions helps write scripts that work everywhere without extra work.