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Eventually, you ll get tired of typing the same command (and its parameters) over and over again, so you ll copy and paste it all into a text file. Give that file a .PS1 filename extension, and you suddenly have a PowerShell script. Now, instead of typing the command over and over, you just run that script, and it executes whatever commands are inside. This is the same pattern that you may have used with batch files in the Cmd.exe shell, but it s typically far less complex than scripting or programming. Don t get me wrong: you can get as complex as you need to with PowerShell. In fact, it supports the same kind of usage patterns as VBScript and other scripting or programming languages. PowerShell gives you access to the full underlying power of the .NET Framework, and I ve seen PowerShell scripts that were practically indistinguishable from a C# program written in Visual Studio. PowerShell supports these different usage patterns because it s intended to be useful to a wide range of audiences, as I described in the previous chapter. The point is that just because it supports that level of complexity doesn t mean you have to use it at that level, and it doesn t mean you can t be extremely effective with less complexity. Here s an analogy: You probably drive a car. If you re like me, changing the oil is the most complex mechanical task you ll ever do with your car. I m not a car geek, and I can t rebuild the engine. I also can t do those cool high-speed J-turns that you see in the movies, and you ll never see me driving a car on a closed course in a car commercial. But the fact that I m not a professional stunt driver doesn t stop me from being an extremely effective driver at a less complex level. Someday I might decide to take up stunt driving for a hobby (I m sure my insurance company will be thrilled), and at that point I ll need to learn a bit more about how my car works, master some new skills, and so on. That option is always there for me to grow into. But for now, I m very happy with what I can accomplish as a normal driver. For now, we re going to stick with being normal PowerShell drivers, operating the shell at a lower level of complexity. Believe it or not, we re the primary target audience for PowerShell, so you ll find that there s an awful lot of incredible stuff that you can do. You just need to master the ability to run commands within the shell, and you re on your way.
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This is a good time to get PowerShell up and running, if you haven t done so already. You can use either the ISE or the regular console host. You ll find the icons for PowerShell and the ISE located on the Start menu, under Accessories. It s very important that you run PowerShell as an Administrator. On Windows Vista and later versions of Windows, User Account Control (UAC) is enabled by default, and it prevents you from running programs as Administrator without taking a special step: right-click the program icon in the Start menu, and select Run as Administrator from the context menu. You need to do that every time you open the application. You can also right-click the icon, select Properties, and modify the program s properties to
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always run as Administrator. I find that to be more convenient, because from then on I can just click the icon in the Start menu to open the shell. Why do you have to start the shell this way Because although Windows PowerShell is constrained by UAC, I like to say that is doesn t participate in UAC. That is, if you try to perform a privileged operation in a non-elevated shell, you will get an Access Denied error message. You won t get the friendly UAC pop-up dialog box that asks you if you want to perform the operation. PowerShell isn t capable of elevating its privilege on the fly, so you have to do so each time you open a shell window.
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