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Hopefully you found the answer. Finally, you need to add up the virtual memory. This is where you ll need to find a new cmdlet, probably by doing a wildcard search with Get-Command or Help. I might try the Add keyword, or the Sum keyword, or even the Measure keyword.
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TRY IT NOW See if you can find a command that would measure the total of a
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numeric property like virtual memory. Use Help or Get-Command with the * wildcard. Hopefully you re trying these little tasks and not just reading ahead for the answer, because this is the key skill in making yourself a PowerShell expert! Once you think you have the answer, you might start in on the iterative approach. To start with, I ll get processes. That s easy enough:
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TRY IT NOW Follow along in the shell, and run the same commands I m run-
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ning. After each, examine the output, and see if you can predict what I ll change for the next iteration of the command. Next, I ll filter out what I don t want. Remember, filter left means I want to get the filter as close to the beginning of the command line as possible. In this case, I m going to use Where-Object to do the filtering, so I want it to be the next cmdlet. That s not as good as having filtering occurring on the first cmdlet, but it s better than filtering later on down the pipeline. In the shell, I ll hit the up arrow on the keyboard to recall my last command, and then add the next command:
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Get-Process | Where-Object -filter { $_.Name -notlike 'powershell*' }
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I m not sure if it s powershell or powershell.exe, so I used a wildcard comparison to cover all my bases. Any process that isn t like that name will remain in the pipeline. I run that to test it, and then hit the up arrow again to add the next bit:
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Get-Process | Where-Object -filter { $_.Name -notlike 'powershell*' } | Sort VM -descending
Hitting Return lets me check my work, and up arrow will let me add the next piece of the puzzle:
Get-Process | Where-Object -filter { $_.Name -notlike 'powershell*' } | Sort VM -descending | Select -first 10
Had I sorted in the default ascending order, I would have wanted to keep the -last
10 before adding my last bit:
Get-Process | Where-Object -filter { $_.Name -notlike 'powershell*' } | Sort VM -descending | Select -first 10 | Measure-Object -property VM -sum
Hopefully you were able to figure out at least the name of that last cmdlet, if not the exact syntax I ve used here.
Common points of confusion
This model running a command, examining the results, recalling it, and modifying it for another try is what differentiates PowerShell from more traditional scripting languages. As a command-line shell, you get those immediate results, and also the ability to quickly and easily modify your command if the results weren t what you wanted. Hopefully you re also seeing the power that you get by combining even the handful of cmdlets that you ve learned so far.
Common points of confusion
Anytime I introduce Where-Object in a class, I usually come across two main sticking points. I tried to hit those pretty hard in the preceding discussion, but if there s any room left for doubt, let s clear it up now.
Filter left, please
You want your filtering criteria to go as close to the beginning of the command line as possible. If you can accomplish the filtering you need on the first cmdlet, do so; if not, try to filter in the second cmdlet so that the subsequent cmdlets have as little work to do as possible. Also, try to accomplish filtering as close to the source of the data as possible. For example, if you re querying services from a remote computer and will need to use Where-Object as I did in one of this chapter s examples consider using PowerShell remoting to have the filtering occur on the remote computer, rather than bringing all of the object to your computer and filtering it there. You re going to tackle remoting in the next chapter, and I ll mention this idea of filtering at the source again there.
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