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TRY IT NOW I m not going to paste the help for Stop-Service into this
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book go ahead and run Help Stop-Service yourself, and follow along with what I m describing. There are three variants of Stop-Service, or three parameter sets (if you forget what a parameter set is, reread chapter 3). Each parameter set seems to provide a different way of specifying the service or services that I want to stop:
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The first parameter set includes a mandatory -Name parameter, meaning that I could just specify the service name (or names) I want stopped. The second parameter set features a mandatory -DisplayName parameter, giving me another way of specifying the service (or services) I want to stop. The third parameter set includes an -InputObject parameter that accepts values of the type ServiceController. That means the -InputObject parameter can accept, as its value, the type of object produced by Get-Service.
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Because mastering the help files is such an important PowerShell skill, I want to take a second to focus on some unrelated things in the help file. You re free to skip this brief discussion if you want to, but be sure to come back to it later.
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The pipeline, deeper
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(continued) Of the three parameter sets for Stop-Service, the first two have a first parameter that accepts string values. Let s say you ran the command Stop-Service BITS. PowerShell needs to decide which of the three parameter sets you ve used. You didn t specify a parameter name, so that eliminates the second parameter set, because it doesn t contain any positional parameters (you ll notice that -DisplayName is mandatory, and the parameter name itself isn t in square brackets, meaning that if you choose to specify a display name you must type the -DisplayName parameter name). Because you provide a string, and not a ServiceController, PowerShell knows that you must be intending to use the first parameter set, and so it interprets the value in the first position of your command (BITS) as the value for the -Name parameter. There s no way that this cmdlet s designer could have made -DisplayName positional (meaning that you wouldn t have to type the -DisplayName parameter name, and could just provide a value for it). Doing so would have created two parameter sets that each accepted a string in the first position, and PowerShell wouldn t have been able to tell which one you were trying to use. These subtle hints from the help file can, once you get used to interpreting them, make it easier to use cmdlets more effectively. Now you know that you can specify the display name of a service you want to start, but if you choose to do so, you ll have to explicitly identify it with the -DisplayName parameter name.
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Now look at the full help, by running Help Stop-Service -full. Scroll down until you get to the help for the -InputObject parameter, because I want to look at that in a bit more detail. Notice that the parameter explanation for -InputObject indicates that it isn t required (after all, you could choose to specify a name or display name instead). It s a named parameter, which means that if you choose to use it, you must type the parameter name. And, most importantly for the current discussion, this parameter accepts pipeline input ByValue. When you run a command like Get-Service -name BITS | Stop-Service, PowerShell executes the commands in order. Get-Service produces those ServiceController objects, and then pipes them to Stop-Service. PowerShell knows that a cmdlet can only accept input via a parameter, so there s nothing magic associated with piping things from one cmdlet to another. The piped input must be assigned to a parameter of the next cmdlet in order for everything to work, so the shell has to look at all of the parameters for the next cmdlet (Stop-Service), and figure out which parameter will accept the objects that have been piped in. PowerShell starts by looking at the type of object that s being piped. In this case, we know the objects are of the type ServiceController, because we used Gm to discover that fact. Next, the shell looks to see if any parameters of the next cmdlet are willing to accept that type of object from the pipeline, meaning that the shell looks to see if any parameters accept values of type ServiceController and are willing to
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