PowerShell Session for Winnipeg .NET User Group

1-Intro.ps1

#Print Strings

"Hello World"

#Run Commands

ping google.com

#Use Variables

$name = "Tyler"; $name

#Quotes and strings
"Hello $name"
# Hello Tyler

'Hello $name'
# Hello $name

#Double quotes allow for placement of variables

$a = Get-Item .
$a.Name
# outputs the current folder to the screen

"This folder is called $a.Name"
# This folder is called C:\Users\Tyler.Name
#Not exactly what I was looking for

"This folder is called $($a.Name)"
# This folder is called Tyler
#That is more like it

2-Commands.ps1

Get-Help Get-Item

Get-Help *-Item #returns all commands ending in "-item"

Get-Command -Module Azure -Verb Get #Get-Command is a great way to find what you can do in a module

Get-Verb #outputs the suggested verbs used in commands with context

3-Arrays.ps1

# Arrays in PowerShell

$a = 1,2,3
$a

$a + 4
$a + 'text'
#Unless created with a known type the array does not care what the contents are

$b = 4,5,6
$a + $b

$a[0]
$a[-1] #last item
$a[0..2] #items between index 0 and 2, inclusive

1..10

4-HashTables.ps1

@{FirstName = 'Tyler'; LastName = 'Doerksen'}
$h = @{}
$h.Name = 'Tyler'

$h2 = @{City = 'Winnipeg'}
$h + $h2

5-RunningScripts.ps1

#create a file called scriptdemo1.ps1 with the following contents

# $name = 'Tyler'
# $name

#Open PowerShell ISE

$name = "not Tyler"

.\scriptdemo1.ps1

$name
# will output "not Tyler"

. .\scriptdemo1.ps1

$name

# will output "Tyler"

# The additional . in front of the script path indicates you want to run the script in the same session as the current window
# This is called dot-sourcing

6-Functions.ps1

function Get-Greeting([string]$Name)
{
  "Hello $Name"
}

Get-Help Get-Greeting

function Get-Greeting()
{
  param([string] $Name)
  "Hello $Name"
}

function Get-Greeting()
{
  [CmdletBinding]
  param([string] $Name)
  if(!$Name)
  {
    Write-Verbose "Unknown Name"
    $Name = "Unknown"
  }
  "Hello $Name"
}

filter Get-Greeting()
{
[Cmdletbinding()]
param(
[Parameter(ValueFromPipeline = $true)]
[string]$Name)

    if(!$Name)
    {
        write-verbose "Unknown Name"
        $Name = "Unknown"
    }

    "Hello $Name"
}

"tyler", "mitch" | Get-Greeting

function Get-Greeting()
{
[Cmdletbinding()]
param(
[Parameter(ValueFromPipeline = $true)]
[string$Name)
Begin {
    Write-Host "Start Greeting"
    Write-Host $Name
}
Process {

    if(!$Name)
    {
        write-verbose "Unknown Name"
        $Name = "Unknown"
    }

    "Hello $Name"
}
End {
    Write-Host "End Greeting"
}
}

"tyler", "mitch" | Get-Greeting

7-DotNet.ps1

$g = [System.Guid];:NewGuid()

[System.AppDomain]::CurrentDomain.GetAssemblies() |
    where { $_.Location } |
    foreach { Split-Path -Leaf $_.Location } |
    sort

$client = New-Object New.WebClient

$client | gm
# outputs the methods and properties of the class

$client | gm DownloadString | fl

Add-Type -TypeDefinition @"
public class MyMathClass {
    public int Add(int n1, int n2) {
        return n1 + n2;
    }
}
"@

$demo = New-Object MyMathClass
$demo.Add(1,2)

[xml]$feed = $client.DownloadString("http://www/dougfinke.com/blog/index.php/feed")
$feed.rss.channel.item | select Title,pubDate

# adding members
$o = "Hello World" | Add-Member -PassThru ScriptProperty Reverse { $this[$this.Length..0] -join "" }