The Microsoft Windows operating system, especially the most recent versions, comes with a wide variety of modules preinstalled. These, as well as any other modules that have been installed, can be viewed using the Get-Module command.

By default, Get-Module shows modules that have been imported (either automatically or using Import-Module); for example, if the command is run from PowerShell ISE, it will show that the ISE module has been loaded:

PS> Get-Module

ModuleType Version Name                            ExportedCommands 
---------- ------- ----                            ---------------- 
Script     1.0.0.0 ISE                             {Get-
                                                   IseSnippet...}
Manifest   3.1.0.0 Microsoft.PowerShell.Management {Add-
                                                   Computer...}
Manifest   3.1.0.0 Microsoft.PowerShell.Utility    {Add-Member...}

The ListAvailable parameter shows a complete list of modules:

Get-Module -ListAvailable 

Modules are listed here if they are found under any of the paths in the %PSMODULEPATH% environment variable. The variable contains the following paths:

PS> $env:PSModulePath -split ';'
C:UserswhoamiDocumentsWindowsPowerShellModules
C:WINDOWSsystem32WindowsPowerShellv1.0Modules
C:Program FilesWindowsPowerShellModules 

Additional paths to search may be added to the %PSMODULEPATH% variable if required.

Modules may exist in more than one location. Get-Module (and Import-Module) will consider each path in order so that if a matching module is found, the search stops (even if a newer version exists in a different directory).

Get-Module can show each instance of a module regardless of the path using the All parameter:

Get-Module <ModuleName> -All -ListAvailable