Get-Process Get-Service in VB.NET

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Get-Process Get-Service
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Just two commands. But what happens if you were to type those commands into the shell manually, hitting Return after each
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TRY IT NOW You re going to have to run these commands on your own to see
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the results; they create fairly long output and it won t fit well within this book or even in a screenshot. When you run the commands individually, you re creating a new pipeline for each command. At the end of each pipeline, PowerShell looks to see what needs to be formatted, and creates the tables that you undoubtedly saw. The key here is that each command runs in a separate pipeline. Figure 17.4 illustrates this: two completely separate commands, two individual pipelines, two formatting processes, and two different-looking sets of results.
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One script, one pipeline
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Figure 17.4 Two commands, two pipelines, and two sets of output in a single console window.
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You may think I m crazy for taking so much time to explain something that probably seems obvious, but it s important. Here s what happens when you run those two commands individually:
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You run Get-Process. The command places Process objects into the pipeline. The pipeline ends in Out-Default, which picks up the objects. Out-Default passes the objects to Out-Host, which calls on the formatting system to produce text output (you learned about this in chapter 8). The text output appears on the screen. You run Get-Service. The command places Service objects into the pipeline. The pipeline ends in Out-Default, which picks up the objects. Out-Default passes the objects to Out-Host, which calls on the formatting system to produce text output. The text output appears on the screen.
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So you re now looking at a screen that contains the results from two commands. I want you to put those two commands into a script file. Name it Test.ps1 or something simple. Before you run the script, though, copy those two commands onto the clipboard. In the ISE, you can highlight both lines of text and press Ctrl-C to get them into the clipboard. With those commands in the clipboard, go to the PowerShell console host and press Enter. That will paste the commands from the clipboard into the shell. They
You call this scripting
Figure 17.5 All commands within a script run within that script s single pipeline.
should execute exactly the same way, because the carriage returns also get pasted. Once again, you re running two distinct commands in two separate pipelines. Now go back to the ISE and run the script. Different results, right Why is that In PowerShell, every command executes within a single pipeline, and that includes scripts. Within a script, any command that produces pipeline output will be writing to a single pipeline: the one that the script itself is running in. Take a look at figure 17.5. I ll try to explain what happened:
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The script runs Get-Process. The command places Process objects into the pipeline. The script runs Get-Service. The command places Service objects into the pipeline. The pipeline ends in Out-Default, which picks up both kinds of objects. Out-Default passes the objects to Out-Host, which calls on the formatting system to produce text output. Because the Process objects are first, the shell s formatting system selects a format appropriate to processes. That s why they look normal. But then the shell runs into the Service objects. It can t produce a whole new table at this point, so it winds up producing a list. The text output appears on the screen.
This different output occurs because the script wrote two kinds of objects to a single pipeline. This is the important difference between putting commands into a script and running them manually: within a script, you only have one pipeline to work with. Normally, your scripts should strive to only output one kind of object, so that PowerShell can produce sensible text output.
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