powershell-training-material

PowerShell Scripting Cheatsheet

Input/OutputObjects EverywhereString Quotes
#Basic Input/Output
$Name = Read-Host "Your Name Plz"
Write-Host "Hello $Name"

$my_string = "Hello"
$my_string.Length #=> 5
$my_string.ToUpper() #=> HELLO

$NAME="John"
Write-Host "Hi $NAME"  #=> Hi John
Write-Host 'Hi $NAME'  #=> Hi $NAME

# Conditional Structure

if-elseswitch-caseexpressions
if($expression -eq $true){
  Write-Host "Cond. True" 
}
elseif{
  Write-Host "2nd True"
}
else{
  Write-Host "Cond. False" 
}

switch ($x)
{
    'value1' {}
    {$_ -in 'A','B','C'} {}
    'value3' {}
    Default {}
} 

$true #=> True
1 #=> True
$null #=> False
$empty = "" #=> False
CmdLet-ReturnsFalse #=> False

# Loop Structure

do-whiledo-untilFor LoopForEach Loop
do
{
  # Code
}
while ($x -gt 0)

do
{
  # Code
}
until ($x -gt 0)

for ($i = 1; $i -lt 99; $i++){ 
  # Code
}

foreach($item in $collection){   
   Write-Output $item
}

# Arrays

Defining ArraysWorking with Arrays
$my_numbers = 1..100
$Fruits = 'Apple', 'Banana', 'Orange'
$Fruits = @('Apple', 'Banana', 'Orange')

$Fruits[0] = "Apple"
$Fruits[1] = "Banana"
$Fruits[2] = "Orange"


Write-Host $Fruits[0]           # Element #0
Write-Host $Fruits.Count        # Number of elements
Write-Host $Fruits[0].Length    # String length of the 1st element
Write-Host $Fruits[0..1]        # Array from first to Nth element
Write-Host $Fruits[-2]          # Second last element of the Array
Hash Table or Dictionary
$my_vm_config = @{
                "hostname" = "vm00002314";
                "pvt_ip" = "10.48.3.12"; 
                "domain"= "vikiscripts.github.io"
}

Write-Host $my_vm_config.pvt_ip #=> 10.48.3.12

# Execute PowerShell Script from GitHub

</td></tr>
Execute a Remote Script
iex ((New-Object System.Net.WebClient).DownloadString('https://gist.githubusercontent.com/hclpandv/76739cc615f3eee0d4722243379d324f/raw/9573fa17aadee9f0b5fb71d38cccefde8b4a220b/CheckSumCalc.ps1'))