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Introduction to Windows PowerShell Scripting
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System and network administrators and other IT professionals can simplify and automate the administration of Windows 7 across their organizations by learning how to use Windows PowerShell as a management tool . The rest of this chapter provides a basic tutorial on using Windows PowerShell for performing and scripting administrative tasks . Some of the new features of Windows PowerShell 2 .0 are also demonstrated . Familiarity with VBScript scripting is assumed throughout, and familiarity with Windows PowerShell 1 .0 can also be helpful when reading this tutorial .
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396 CHapTER 13 Overview of Management Tools
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Understanding Cmdlets
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indows powerShell can run several different kinds of commands including scripts, external programs, and user-defined functions. It also has compiled
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cmdlets (pronounced command-lets), which are loaded into the Windows powerShell environment from .NET DLL files. Windows powerShell loads a default set of these DLLs when it starts; without them, it would have just the basic grammar of a scripting language without any vocabulary. These DLLs, which can be registered and loaded as snap-ins or included as part of a Windows powerShell module, can also contain the providers that Windows powerShell uses to create drives: powerShell has drives for the Windows Registry and for variables as well as for file systems. Developers can provide DLLs to add extra cmdlets and providers. For example, in Windows Server 2008 R2, the active Directory team provides a module whose DLL implements a rich set of commands and a provider so active Directory can be treated as a drive. System administrators can write their own commands, known as functions, in Windows powerShell. Cmdlets have a standardized naming convention that takes the form verb-noun, which makes them easy to discover. However, to save typing and to allow old familiar names to be used, Windows powerShell also has one other type of command the alias, which replaces one command name with another. When we talk about a command in Windows powerShell, we may be referring to cmdlets, functions, alias scripts, external programs, or any combination of these linked together in a pipeline (in which the output of one command becomes the input of the next).
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Working with Windows powerShell Cmdlets
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For people who come from a Windows background, Windows PowerShell will take some getting used to, because it provides a new kind of capability to the environment . On the one hand, the Windows PowerShell console enables you to type commands in an interactive manner . On the other hand, Windows PowerShell is a language that lets you write scripts . It is similar to taking the command prompt and putting VBScript inside it . In other words, you get two tools in one . The heart of Windows PowerShell is the cmdlets that are included with the product . These cmdlets are built into Windows PowerShell, but they can also be written by other people to provide additional capability . You can open Windows PowerShell and obtain information about all the processes running on your computer . The Get-Process cmdlet returns informaIntroduction to Windows PowerShell Scripting CHapTER 13 397
tion about the process ID, how much CPU time is being consumed, and the level of memory consumption . The command is Get-Process, and the results are seen in Figure 13-1 .
FIgURE 13-1 The Get-Process cmdlet provides detailed process information .
If you are interested in services, the Windows PowerShell cmdlet is Get-Service . When you run this command, you obtain information about the service name, status, and even the display name . The results are shown in Figure 13-2 . If you want to obtain the date, the command is Get-Date, and if you want to find the culture settings on the computer, you use Get-Culture . But you are not limited to just using Windows PowerShell cmdlets within the PowerShell console . You can also use external commands such as Getmac .exe, as shown in Figure 13-3 .
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