powershell-samples.ps1

<# start of block comment 
    
Why powershell? 

 * it object oriented
 * rich script environment 
 * bulk operations 
 * interactive shell 
 * task automation 
 * use of consistent, repetable task
 * work with built in provider
 
 end of block comment#> 

 #single line comment
 #variables in powershell starts with a dollar sign ($)
 #variables only exists inside the current powershell window

$var = 2

Write-Host $var

$var2 = "Hello Powershell";

Write-Host $var2

<#
As you can see powershell automatically figures out what are the data types of your variables. 
However; if you can you can explicitly say to powershell what the datatype is see an example below: 
#>

[string]$var3 = "Say What? $var2"

Write-Host $var3


#What are the data types we can use in Powershell: integers, floating points values, strings, booleans and datetime values.

#region data-types
$sum = 1+1 #integer 

Write-Host $sum
Write-Host $sum.GetType() #get the value type

$stringConcat = "Hello Again" + $sum + "x"

Write-Host $stringConcat
Write-Host $stringConcat.GetType()

<#
Notes to remember:
About $true and $false it is built in variables in Powershell used for displaying true and falses. 
#>

$youLovePowershell = $true;
$youLoveMsDOS = $false;

Write-Host $youLovePowershell
Write-Host $youLovePowershell.GetType()
#Write-Host -is $true -eq 1
#Write-Host -is $false -eq 0

$currentDate = Get-Date

Write-Host $currentDate
Write-Host $currentDate.GetType()

#endregion 

<#
Powershell Comparison Operators
-eq (equal)
-ne (not equal)
-lt (less than)
-le (less than or equal)
-gt (greater than)
-ge (greater than or equal)
#>

1 -eq 1 #equal
1 -ne 1 #not equal
1 -lt 1 #less than
1 -le 1 #less than or equal
1 -gt 1 #greater than
1 -ge 1 #greater than or equal

<#powershell arrays#>

$fruits = @('apple', 'banana', 'orange','avocado')

Write-Host $fruits[0]

foreach($item in $fruits){
    Write-Host $item
}

$myFruits = @('apple', 'avocado', 'banana', 'mango','dragon-fruit')

foreach($fruit in $myFruits)
{
    if($fruit -eq 'apple') 
    {
        Write-Host -ForegroundColor "Green" $fruit
        continue
    }
    
    Write-Host $fruit
}
function sayHello(){

    return "Hello function"
}

$result = sayHello

Write-Host $result


#region Strings 
$name = "Powershell"
Write-Host $name.ToLower()
Write-Host $name.ToUpper()
Write-Host $name.Contains("shell")
$newName = $name.Replace("shell", "shells")
Write-Host $newName
#endregion