🏃‍♂️Example Excerises

PowerShell Practice Notes

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🔹 Basic Notes

• ISE (Integrated Scripting Environment): A GUI for writing and debugging PowerShell scripts.

• Everything in PowerShell is an OBJECT ✅

• Check PowerShell version:

  $PSVersionTable.PSVersion

• Ping a website:

  ping spacex.com

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🎓 Learning Tools

• Videos Used: PowerShell Tutorial

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🔹 About Cmdlets

• Cmdlet format: Verb-Noun (unless it's a custom function).

• Check execution policy:

  Get-ExecutionPolicy

• Change execution policy:

  Set-ExecutionPolicy RemoteSigned

• RemoteSigned allows custom scripts to run.

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📝 Basic Cmdlets

• Print text:

  Write-Host "Hello World! " -NoNewline
  Write-Host "Hello Again!"

• Find commands:

  Get-Command
  Get-Command -CommandType Cmdlet

• Get help for a command:

  Get-Help Write-Host -Full

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🔗 Piping Cmdlets

• Write to a file:

  "May the force be with you!" | Out-File forcewithwho.txt

• View file content:

  Get-Content .\forcewithwho.txt

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🔹 Variables

• Create a variable:

  $FavCharacter = "Spongebob"

• Output a variable:

  Write-Output $FavCharacter

• Save variable to a file:

  $FavCharacter | Out-File FavCharacter.txt
  Get-Content .\FavCharacter.txt

• Find variable type:

  $FavCharacter.GetType()

• List all properties:

  $FavCharacter | Select-Object -Property *

• List all methods:

  Get-Member -InputObject $FavCharacter

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🔹 Arrays

• Define an array:

  $Jedi = @("Matthew","Mark","Luke","John")

• Get first element:

  $Jedi[0]  # Arrays start at index 0

• Add an element:

  $Jedi += "David"

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🔹 HashTables

• Define a hashtable:

  $Family = @{David = "Dad"; Steph ="Mum"; Charlotte ="Daughter"}

• Add an entry:

  $Family.Add("Midnight","Cat")

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🏗️ Collecting User Input

• Prompt for user input:

  Write-Host "What is your favorite game system?"
  Write-Host "1. NES"
  Write-Host "2. Wii"
  Write-Host "3. N64"
  $FavSystem = Read-Host "Fav game system?"

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🔹 Conditional Statements

• If-Else Example:

  $PokemonCaught = 808
  If ($PokemonCaught -eq 908) {
      Write-Host "You're a Pokemon Master!"
  } Else {
      Write-Host "Go catch more Pokemon!"
  }

• ElseIf Example:

  $PokemonNum = 200
  If($PokemonNum -ge 0 -and $PokemonNum -le 151) {
      Write-Host "Your Pokemon is from Kanto!"
  } ElseIf ($PokemonNum -ge 152 -and $PokemonNum -le 251) {
      Write-Host "Your Pokemon is from Johto!"
  }

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🔹 Loops

• For Loop:

  $Pets = @("cat","dog","fish","lizard","snake")
  For ($counter = 0; $counter -lt $Pets.Length; $counter++) {
      Write-Host "Hey, it's" $Pets[$counter]
  }

• ForEach Loop:

  Foreach ($Pet in $Pets) {
      Write-Host $Pet "has arrived!"
  }

• While Loop:

  $Office = @("Jim","Pam","Dwight","Michael")
  $counter = 0
  While ($counter -lt $Office.Length) {
      Write-Host $Office[$counter] "is going to the Mall! "
      $counter++
  }

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🔹 Functions

• Define a function:

  function Test-SpaceX {
      [CmdletBinding()]
      param(
          [Parameter(Mandatory)]
          [int32]$PingCount
      )
      Test-Connection spacex.com -Count $PingCount
  }
  Test-SpaceX -PingCount 3

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🔹 Error Handling

• Using Try-Catch:

  try {
      Test-SpaceX -PingCount 3
  } catch {
      Write-Output "Launch Problem"
      Write-Output $_
  }

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🔹 File Operations

• Create a file:

  New-Item -Path "C:\Users\YourName\Documents\ewok.txt" -ItemType "file" -Value "Praise C3PO!"

• Move a file:

  Move-Item -Path "C:\Users\YourName\Documents\ewok.txt" -Destination "C:\Users\YourName\Documents\Scripts\"

• Delete a file:

  Remove-Item .\ewok.txt

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🔹 Active Directory (Admin Mode)

• Import Active Directory Module:

  Import-Module ActiveDirectory

• Get a user:

  Get-ADUser fbaggins

• Create a new AD user:

  New-ADUser -Name "Luke Skywalker" -GivenName "Luke" -Surname "Skywalker" -SamAccountName "lskywalker" -UserPrincipalName "[e-mail]"

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⚡ Quick Tip

• Use Clear-Host to clear the console screen.

• Use Get-Process | Sort-Object WorkingSet64 -Descending | Select-Object -First 10 to find top 10 memory-consuming processes.

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