====== PowerShell ======
By default Windows 10 and 11 comes with PS 5.1. You can get more modern PowerShell with winget:
  winget install --id Microsoft.Powershell --source winget
that's all.

You can check which versions are available with
  winget search Microsoft.PowerShell
  
===== How to run new PowerShell =====
New PowerShell will be installed additionally to existing PS. In Terminal after restart you will find new profile:
  * Windows PowerShell - old profile, PS 5.1
  * PowerShell - new profile, PS 7.*

===== How to find PowerShell version =====
You can always find which PS version you run by running
  get-host
  
===== How to analyze system performance with PowerShell =====
Check who uses CPU:
  Get-Process | Sort-Object -Descending CPU | Select-Object -First 20
Check who uses memory:
  Get-Process | Sort-Object WorkingSet64 -Descending |
  Select-Object Name, @{Name='Memory (MB)';Expression={[math]::Round($_.WorkingSet64/1MB,2)}} |
  Select-Object -First 15
Quick memory overview (data in kilobytes):
  Get-WmiObject Win32_OperatingSystem | Select-Object TotalVisibleMemorySize, FreePhysicalMemory
Calculate free memory percentage:
  $os = Get-WmiObject Win32_OperatingSystem
  $pctFree = [math]::Round(($os.FreePhysicalMemory / $os.TotalVisibleMemorySize) * 100, 2)
  Write-Host "Memory Utilization: $pctFree% Free"  
Get 50 last messages from system EventLog:
  Get-EventLog -LogName System -EntryType Error, Warning -Newest 50
Show uptime (old Windows versions):
  (New-TimeSpan -Start (Get-CimInstance Win32_OperatingSystem).LastBootUpTime -End (Get-Date))

===== Working with files and folders =====  
[[software:os:windows:powershell:files|How to work with files and folders]]