To find out the parameters of a Cmdlet, you can call the Windows PowerShell Help. To be faster you can use some tricks to get more out of Parameters.

Old Style: Get-Help

If you want to get all about parameters, then Get-Help is your friend.

Get-Help Get-ChildItem -Online

Get-Help Get-ChildItem -ShowWindow

Get-Help Get-ChildItem -Examples

Get-Help Get-ChildItem -Full

or more specific:

Get-Help Get-ChildItem -Parameter Path

See also my German post: PowerShell: Hilfe verwenden (Get-Help).

CTRL + Space

Instead of browsing the help you can use CTRL + Space. Simply type Get-ChildItem. Then type – and then press CTRL + Space. This shows all parameters and afterwards you can use the arrow keys to choose one.

Using Get-Command

To show all parameters, you can also use Get-Command.

(Get-Command Get-ChildItem).Parameters

But I like it user-friendly. So I run

(Get-Command Get-ChildItem).Parameters.Values | Select-Object Name,Aliases,Switchparameter

To show the location of the Helpfile type

(Get-Command Get-ChildItem).Helpfile

To get the URI of the Online Help run

(Get-Command Get-ChildItem).HelpUri

To open the found URL type

start http://go.microsoft.com/fwlink/?LinkID=113308