PowerShell

Pipes

$_ Variable

Get-Service | WHERE {$_.status -eq "Running"} | SELECT displayname
# “$_.” defines current element in the pipe

Get-Service | Sort-Object -property Status

$mydatge = Get-Date
$mydatge | Get-Member

Fucntion

Send-Greeting -name Claude




function Send-Greeting
{
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$true)]
        [string] $Name
    )

    Process
    {
        Write-Host ("Hello " + $Name + "!")
    }
}

if

$currentDate = Get-Date
$messageOfTheDay = ""

if($currentDate.Day % 2 -ne 0)
{
    $messageOfTheDay = "Today is an odd Day, "
}
else
{
    $messageOfTheDay = "Today all should be even, "
}

switch (($currentDate.DayOfWeek))
{
    "Monday" { $messageOfTheDay = $messageOfTheDay + "that being said you should be working..." }
    "Tuesday" { $messageOfTheDay = $messageOfTheDay + "that being said you should be working..." }
    "Wednesday" { $messageOfTheDay = $messageOfTheDay + "that being said you should be working..." }
    "Thursday" { $messageOfTheDay = $messageOfTheDay + "that being said you should be working..." }
    "Friday" { $messageOfTheDay = $messageOfTheDay + "that being said you should be working..." }
    "Saturday" { $messageOfTheDay = $messageOfTheDay + "yay it's the Weekend!!!" }
    "Sunday" { $messageOfTheDay = $messageOfTheDay + "yay it's the Weekend!!!" }
    default { $messageOfTheDay = $messageOfTheDay + "This script only knows the 7 weekdays...." }
}

echo $messageOfTheDay

for, while, doWhile

for ($i = 0; $i -lt 10; $i++)
{
    Write-Host $i
}

$i = 0
while ($i -lt 10)
{
    Write-Host $i
    $I++;
}

$i = 0
Do 
{
    Write-Host $i
    $I++;
} while($i -lt 10)

array

$myarray = 'a', 'b', 'c'
$myarray

WHERE

Clear-Host #Clears the display
$GuyDir = "C:\Temp"
$FilesExe = gci $GuyDir -recurse #GCI: Get Child Items
$List = $FilesExe | ? {$_.extension -eq ".pem"}
$List | Sort-Object -unique | Format-Table name

Clear-Host #Clears the display
$GuyDir = "C:\Temp"
$FilesExe = gci $GuyDir -recurse #GCI: Get Child Items
$List = $FilesExe | WHERE {$_.extension -eq ".pem"}
$List | Sort-Object -unique | Format-Table name

Clear-Host #Clears the display
$GuyDir = "C:\Temp"
$FilesExe = gci $GuyDir -recurse #GCI: Get Child Items
$List = $FilesExe | Where-Object {$_.extension -eq ".pem"}
$List | Sort-Object -unique | Format-Table name

call operator &

&: Runs the pipeline before it in the background, in a PowerShell job. This operator acts similarly to the UNIX control operator ampersand (&), which runs the command before it asynchronously in subshell as a job.

This operator is functionally equivalent to Start-Job. By default, the background operator starts the jobs in the current working directory of the caller that started the parallel tasks.

 & $ENV:windir\System32\HostName.exe