WMIC CPU Get

Windows - wmic cpu get LoadPercentage always returns empty value
By Ethan Wilansky

Microsoft is creating a lot of good reasons to make the command prompt in Windows XP and the Windows Server 2003 family your home for systems management. Windows Management Instrumentation Command-line (WMIC), which uses the power of Windows Management Instrumentation (WMI) to enable systems management from the command line, is one of those reasons.

WMI has been an important part of Microsoft's systems management initiative since Microsoft Systems Management Server (SMS) 2.0 and has grown in popularity since the introduction of Windows 2000. However, until the introduction of WMIC, you couldn't easily access the WMI repository or the WMI namespace from a command prompt.

What Is WMIC?

WMIC extends WMI for operation from several command-line interfaces and through batch scripts. Before WMIC, you used WMI-based applications (such as SMS), the WMI Scripting API, or tools such as CIM Studio to manage WMI-enabled computers. Without a firm grasp on a programming language such as C++ or a scripting language such as VBScript and a basic understanding of the WMI namespace, do-it-yourself systems management with WMI was difficult. WMIC changes this situation by giving you a powerful, user-friendly interface to the WMI namespace.

WMIC is more intuitive than WMI, in large part because of aliases. Aliases take simple commands that you enter at the command line, then act upon the WMI namespace in a predefined way, such as constructing a complex WMI Query Language (WQL) command from a simple WMIC alias Get command. Thus, aliases act as friendly syntax intermediaries between you and the namespace. For example, when you run a simple WMIC command such as

useraccount list brief

from the WMIC command prompt to get user account information, the Useraccount alias performs a WQL query of the Win32_Useraccount class and displays specific data from this class in text format. WMIC also displays the Win32_Useraccount class's properties at the console in text format. WMIC can return the results of a command in other formats, such as XML, HTML, and Comma Separated Value (CSV).

WMIC stores aliases as instances of a class in the WMI schema. The default alias classMSFT_CliAlias—and other classes that support WMIC are stored in the schema's default namespace, or role—root\cli. Think of a role as simply another WMI namespace that's specifically designed to support WMIC. The default role, root\cli, connects to the root\cimv2 namespace to operate on the classes within root\cimv2. You won't typically use CIM Studio when you run WMIC, but you can use CIM Studio to find the root\cli namespace in a list of WMI namespaces. Figure 1 shows the root\cli node and some of the properties in the MSFT_CliAlias class.

Figure 1: The root\cli namespace and MSFT_CliAlias

You can add new aliases to the root\cli namespace and to other namespaces. You can also access the WMI namespace directly with the Class and Path commands. Later in this article, I show you how to use these commands.

How to Run WMIC

To invoke the WMIC command prompt, type

wmic

in the standard XP or .NET Server command interpreter (cmd.exe), a Telnet session, or the Run dialog box. These startup methods are available locally or through a .NET Server Terminal Services session.

The first time you start WMIC, Windows installs it on the computer and displays the WMIC command prompt, wmic:root\cli>. At this prompt, you enter commands interactively. For example, the command

process where name='outlook.exe' call terminate

closes Microsoft Outlook if it's running. After the command runs, the WMIC command prompt reappears. Note that you must type each command in this article on one line, not split across multiple lines, for the commands to run properly. (Some commands in the tables and listings in this article are split across multiple lines for publication purposes.)

WMIC also runs in noninteractive mode. This mode is especially useful when you need to complete a single task or you need to run WMIC commands in a batch file. To run a command in noninteractive mode, you start WMIC and run the command in the same line of code. For example, you can open a command prompt and type

wmic /node:SERVER1 printer list status

to check the status of printers attached to SERVER1. In this example, WMIC starts, uses the /node switch to establish a remote connection to SERVER1, and runs a command to display printer status information. After the command runs and displays results, the command prompt reappears.

You can remotely access any WMI-enabled computer from any computer running WMIC. The computer you want to access doesn't require WMIC. For example, you can start WMIC from a computer running XP Professional Edition to manage a mix of computers running XP, Win2K, Windows NT 4.0, Windows Me, and Windows 9x.

WMIC Command-Line Components

WMIC uses global switches, aliases, verbs, commands, and command-line help to empower the interface. Global switches are settings that apply to and for the entire WMIC session. For example, the /trace:on switch enables error tracing. While this switch is on, WMIC returns error information for every command you execute. The /node switch lets you access a remote computer. The /interactive:on switch ensures that WMIC prompts you for confirmation before performing delete operations. Other global switches include /role, /user, /implevel, and /namespace.

As I explained earlier, aliases are the friendly syntax intermediaries between you and the WMI namespace. Verbs are the actions you want to take when specifying an alias. I've already shown you the List and Call verbs. Table 1 describes the other WMIC verbs and provides a sample command for each one.

Table 1 WMIC Verbs

Verb

Sample Command

Description

Assoc

group where name= 'administrators' assoc

Shows all the associations that the Administrators group has with the system. For example, Administrators group members and the drives that they own appear in the list of properties displayed.

os assoc

Displays information about the OS and installed patches and hotfixes.

Create

environment create name="progloc", username="wkst01\ ethanw", variablevalue= "%programfiles%\prog01"

Adds a variable named Progloc and sets its value to a folder below the Program Files folder. For example, the sample command is adding this variable to the Ethanw user account on the WKST01 workgroup computer.

Delete

environment where(name= "progloc") delete

Deletes the Progloc environment variable. To avoid unintended deletions when testing a WMIC command that uses the Delete verb, use the /interactive:on global switch. You'll then be prompted to confirm each deletion.

Get

partition get bootpartition, description, deviceid, bootable

Returns the boot-partition Boolean (true or false), description string, and device ID properties of the partition alias.

Set

path WIN32_USERACCOUNT where(name="user01") set disabled="true"

Disables the User01 user account on a member server or workstation.

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