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There is one additional script structure we must master, the foreach construction. Since there is more than one drive we need the foreach loop below. Observe how this construction requires a placeholder ($drive in $disk).
I was curious to discover what other WMI Objects were available for scripting; then I remembered the -List switch from another PowerShell command (Get-Eventlog -List). Thus I tried:
WmiObject $variables.
Get-WmiObject -query "select * from Win32_LogicalDisk where DriveType =’3′ "
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As expected, when you use Get-Wmiobject PowerShell defaults to the current machine; unlike VBScript, you don’t have to add "." However, if you want to run the script against another machine you need to add the -computerName parameter. Incidentally, the target machine must have WMI, but does not need PowerShell. As all Microsoft Computers after Windows 2000 have WMI, there should be no problem; your only real concern could be firewalls. Knowledge of the -computerName parameter helps when you want a script which loops through multiple hostnames, or IP addresses.
-query.
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-computerName.
Skills that you develop through experimenting with PowerShell and WMI will help you manage your Exchange 2007 server. With practice, you will also be able to adapt these techniques to Active Directory and Windows Server 2008. My point is that while PowerShell is clearly has a future, you can get started here and now by creating WMI cmdlets.
# PowerShell Get-WmiObject see more parameters Clear-Host Get-Help Get-Wmiobject -full.
One of the most useful jobs for PowerShell is to create a bank of WMI based scripts. Furthermore, scripting WMI with PowerShell is much easier and more efficient than WMI with VBScript.
Introduction to PowerShell’s WMI Techniques.
Get-WmiObject Alias Gwmi.
Get-WmiObject -namespace "root\cimv2" -List.
-filter.
Get-Wmiobject -class Win32_WmiSetting ` -namespace "root\cimv2" -computerName bigserver.

The reason that the -namespace parameter is optional because Wmiobject has a default value of: root\cimv2. Thus the time to include this parameter is when you wish to use a different namespace, such as: root\directory\ldap.
WmiObject Get-Member.
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WmiObject – Help with Parameters.
Let us kill two birds with one stone. Firstly, I want to introduce variables and secondly, I want to filter the properties for a WMI Object. This is the idea, let us set a variable called $disk equal to Get-WmiObject Win32LogicalDisk. Now we can call individual properties, for example $disk.Name, or $disk.Size.
Summary of PowerShell Get-WmiObject.
Instead of Get-WmiObject you may see gwmi, this is one of the most commonly used PowerShell aliases. This is a technique for checking to see if a PowerShell cmdlet has one or more aliases.
Get-WmiObject -List | Where-Object.
PowerShell WMI Techniques.
Get-WmiObject Win32_LogicalDisk | Get-Member.
Note 11: To concentrate on the main feature -filter, I omitted the optional parameters that we covered previously.
Get-WmiObject is the key command. As we will see, it unlocks zillions of classes such as Win32_Computer, here is the simple example that got me interested in PowerShell WMI:
Get-WmiObject Win32_LogicalDisk -filter "Device >
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Note 12: As with -filter, you need to be careful with syntax of the -query parameter. Observe the quotes, and how I have separated the single quote from the double quote with a space: = ‘3’ ". In fact, as 3 is a numeric value, we could remove these single quotes and simplify the expression to: where DriveType = 3.
WMI Perspective.
Sample Output (Heavily truncated)
$dsk= Get-WmiObject Win32_LogicalDisk foreach ( $drive in $dsk )
Domain : cp.mosel Manufacturer : VIAK8T Model : AWRDACPI Name : BIG-SERVER PrimaryOwnerName : Guy TotalPhysicalMemory : 2146910208.
Here is another example, this time PowerShell interrogates the LogicalDisk:
Get-WmiObject – Getting Started.
Please email me if you have any example scripts. Also please report any factual mistakes, grammatical errors or broken links, I will be happy to correct the fault.
To illustrate the -filter parameter, let us set the scene: you wish to interrogate the logical disk, but you only want information about the ‘c:’ drive. Incidentally, -filter is much easier than comparable constructions in VBScript.
To recap, we begin with the variable $disk. We set its value = Get-WmiObject Win32_LogicalDisk. We want to display the name $drive.Name and the size $drive.Size. Because the raw disk size is in bytes, we best convert to gigaabytes (GB), thus we need to divide by 1024 x 1024 x 1024 (1073741824). [int] displays the number as an integer.
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Get-Wmiobject -class Win32_WmiSetting -namespace "root\cimv2"
Note 14: PowerShell 2.0 has built-in math functions to make the calculation easier. Try substituting: ($drive.Size/1Gb), or ($drive.Size/1Mb) if you prefer megabytes.
Five useful Wmiobject Parameters.
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Note 10: PowerShell’s usual comparison operators employ -eq. However, here -filter requires the equals sign.
Note 2: On other pages I use plain ‘Where’, or even ‘?’ instead of the full ‘Where-Object’.
The full syntax to specify the class and the namespace:
Get-WmiObject -List |Where-Object ` | Out-File D:\wmi\win.txt.
Imagine WMI as a database, which keeps information about a computer’s components such as the: BIOS, services and network settings. Regard WMI as a method for collecting data about a machine’s hardware and software. View WMI as a pipe, which magically connects to the core of any Microsoft operating system (post 2000). Think of WMI as a having its own PowerShell dialect, for example the WQL select clause. Treat WMI as a microscope, and use it to probe the operating system’s objects and their properties.
See More Microsoft PowerShell WMI Examples:
A different namespace: "root\directory\ldap"
Note 1: The tiny backtick (`) tells PowerShell that the command continues on the next line.
Next, I redirected the output from the screen to a file by appending ‘Out-File’: out-File WmiObject.txt. To make:
Wouldn’t it be useful to get a list of all the properties on a PowerShell object? The answer is Get-Member. Here is an example of applying the Get-Member command to examine the Win32_Logical Disk:
Note 9: Pay close attention to the quotes. One set of double quotes surrounding "Device >
Note 6: To cope with word-wrap I added the tiny backtick ` command. This tells PowerShell that there is one command but it is split over two lines.
Get-Wmiobject -class Win32_WmiSetting.
Get-WmiObject -namespace "root\directory\ldap" -List.
My next problem was the list was too long, therefore I added a ‘Where’ filter.
Note 5: If you would like to run my cmdlet on your network, then please amend ‘bigserver’ to the name of a real machine on your subnet.
Whenever I think about WMI for any length of time, it hits me: the operating system must know everything that’s going on! Therefore, provided the PowerShell script has sufficient rights, it can use WMI and tap into that vast fountain of operating system knowledge. The Windows operating system must know ‘stuff’ such as how much memory each process is using, how much free space there is on each partition, which devices are on which Bus. It is even possible to manipulate or ‘set’ values on some of these properties and thus achieve configuration via scripts rather than GUIs.
-namespace.
Drive Letter Size GB Drive = A: Size = 0 Drive = B: Size = 0 Drive = C: Size = 49 Drive = D: Size = 29 Drive = E: Size = 85.
TypeName: System.Management.ManagementObject#root\cimv2\Win32_LogicalDisk Name MemberType Definition —– ———– ———- add_Disposed Method System.Void add_Disposed(EventHandler value) Clone Method System.Object Clone() ………….. Access Property System.UInt16 Access Availability Property System.UInt16 Availability BlockSize Property System.UInt64 BlockSize Caption Property System.String Caption Compressed Property System.Boolean Compressed …………..
Extra Maths Example.
Abbreviated version of the same cmdlet.
Researching WMI Classes with ‘Where-Object’
# PowerShell Get-WmiObject example to list classes Clear-Host Get-WmiObject -List.
Learning Points.
When you employ Get-Wmiobject the first thing you want to specify is the class of the object, for example: Win32_LogicalDisk. If this class name follows directly after Get-Wmiobject there is no need to explicitly use the -class parameter. PowerShell assumes from the first position that the word defines the type of class you wish to script.
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Learning Points.
# Cmdlet to display the size of disk partitions $dsk= Get-WmiObject Win32_LogicalDisk "Drive Letter Size GB" foreach ( $drive in $dsk ) " Size = " + [int]($drive.Size/1073741824)>
# PowerShell GetWmiObject Example Get-WmiObject Win32_Computersystem.
-class.
Results (Your values for Size will be different!)
# List Get-WmiObject properties Clear-Host Get-WmiObject Win32_LogicalDisk | Get-Member.
When I am in ‘let us get started’ mode, I gloss over the optional PowerShell commands. However, when we need to troubleshoot, then the secret of success is knowledge of a command’s parameters. To reveal the full list of parameter, let’s call for help:
Note 7: As far as I can see, the shorter -computer works just as well as the longer -computer Name . In fact, this is an example of PowerShell’s intelligence, as soon as the word that you are typing becomes unique, then PowerShell automatically fills in the missing letters. To see what I mean try -comput, or even -comp.
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Note 4: Interestingly, when you explicitly define the namespace, the command displays more properties, than if you omit the parameter and rely on the default.
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In this example, imagine that we need information about the hard disk, but we don’t want the results cluttered with data about floppy drives, CD or DVD drives. If you are familiar with any dialect of SQL you may recognise the select statement below:
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Get-WmiObject is a good bellwether for PowerShell. Contrast the ease with which PowerShell displays WMI objects, with the struggle which VBScript achieves the same result.
And even better:
Note 13: In PowerShell v 2.0 $Disk appears to be a built-in variable that is why I changed to $dsk.
# Get-WmiObject Alias Gwmi Clear-Host Get-Alias -definition Get-WmiObject.
To appreciate the beauty of a crystal, you should examine the facets from different angles. The same applies to the diamond that is WMI; I recommend that to gain perspective we investigate WMI from these five angles.
Note 3: I expect you have guessed that PowerShell commands are case insensitive. At present I am not sure which is best, WmiObject, wmiObject or WmiObject – they all produce the same results. Another minor point, since the verb ‘get’ is the default, you can shorten the command to: WmiObject Win32_computersystem. Or if you like aliases: gwmi Win32_computersystem.
# PowerShell Get-WmiObject example Clear-Host Get-WmiObject -List | Out-File WmiObject.txt.
Topics for PowerShell WMI Techniques.
With the brackets it is always worth paying attention to detail. PowerShell is particular about the style of bracket, for example or even (int) draw an ‘unexpected token’ error message. Equally, the foreach construction needs the simple elliptical brackets (), while the properties are encased in curly <> brackets.
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