Where-Object - Powershell 2.0 CmdLet

Microsoft Windows PowerShell is a command-line shell and scripting tool based on the Microsoft .NET Framework. It is designed for system administrators, engineers and developers to control and automate the administration of Windows and applications.

More than hundred command-line tools (so called "cmdlets") can be used to perform system administration tasks and Windows Management Instrumentation (WMI). These cmdlets are easy to use, with standard naming conventions and common parameters, and standard tools for piping, sorting, filtering, and formatting data and objects.

Where-Object

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Short description
Creates a filter that controls which objects will be passed along a command pipeline.

Syntax
Where-Object [-FilterScript] <scriptblock> [-InputObject <psobject>] [<CommonParameters>]

Description
The Where-Object cmdlet selects objects from the set of objects that are passed to it. It uses a script block as a 
filter and evaluates the script block for each object. If the result of the evaluation is True, the object is retur
ned. If the result of the evaluation is not True, the object is ignored.