Group-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.

Group-Object

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Short description
Groups objects that contain the same value for specified properties.

Syntax
Group-Object [-AsHashTable] [-AsString] [[-Property] <Object[]>] [-CaseSensitive] [-Culture <string>] [-InputObject
 <psobject>] [-NoElement] [<CommonParameters>]

Description
The Group-Object cmdlet displays objects in groups based on the value of a specified property. Group-Object returns
 a table with one row for each property value and a column that displays the number of items with that value.

If you specify more than one property, Group-Object first groups them by the values of the first property, and then
, within each property group, it groups by the value of the next property.