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Get-Process | Sort VM -desc
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I also abbreviated -descending to -desc, and the result is exactly what I was looking for. The -property parameter accepts multiple values (which I m sure you saw in the help file, if you looked). In the event that two processes are using the same amount of virtual memory, I d like them sorted by process ID, and this will accomplish that:
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Get-Process | Sort VM,ID -desc
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As always, a comma-separated list is the way to pass multiple values to any parameter that supports them.
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Selecting the properties you want
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Another useful cmdlet is Select-Object. It accepts objects from the pipeline, and you can specify the properties that you would like displayed. This enables you to access properties that are normally filtered out by PowerShell s configuration rules, or to trim the list down to a few properties that interest you. This can be very useful when piping objects to ConvertTo-HTML, because that cmdlet usually builds a table containing every property. Compare the results of these two commands:
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Get-Process | ConvertTo-HTML | Out-File test1.html Get-Process | Select-Object -property Name,ID,VM,PM | Convert-ToHTML | Out-File test2.html
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TRY IT NOW Go ahead and run each of these commands separately, and then
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examine the resulting HTML files in Internet Explorer to see the differences.
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Objects: just data by another name
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Take a look at the help for Select-Object (or you can use its alias, Select). The -property parameter appears to be positional, which means I could shorten that last command to this:
Get-Process | Select Name,ID,VM,PM | ConvertTo-HTML | Out-File test3.html
Spend some time experimenting with Select-Object. In fact, try variations of this command, which allows the output to appear on the screen:
Get-Process | Select Name,ID,VM,PM
Try adding and removing different process object properties from that list and reviewing the results. How many properties can you specify and still get a table as the output How many properties force PowerShell to format the output as a list rather than as a table
Objects until the very end
The PowerShell pipeline always contains objects, right until the last command has been executed. At that time, PowerShell looks to see what objects are in the pipeline, and then looks at its various configuration files to see which properties will be used to construct the onscreen display. It also decides whether that display will be a table or a list, based on some internal rules and on its configuration files. (I ll explain more about those rules and configurations, and how you can modify them, in chapter 8.) An important fact is that the pipeline can contain many different things over the course of a single command line. For the next few examples, I m going to take a single command line and physically type it so that only one command appears on a single line of text. That ll make it a bit easier to explain what I m talking about. Here s the first one:
Get-Process | Sort-Object VM -descending | Out-File c:\procs.txt
In this example, I start by running Get-Process, which puts process objects into the pipeline. The next command is Sort-Object. That doesn t change what s in the pipeline; it just changes the order of the objects, so at the end of Sort-Object, the pipeline still contains processes. The last command is Out-File. Here, PowerShell has to produce output, so it takes whatever s in the pipeline processes and formats them according to its internal rule set. The results go into the specified file. Next up is a more complicated example:
Get-Process | Sort-Object VM -descending | Select-Object Name,ID,VM
This starts off in the same way. Get-Process puts process objects into the pipeline. Those go to Sort-Object, which sorts them and puts the same process objects into the pipeline. Select-Object works a bit differently, though. You see, a process object
Objects until the very end
always has the exact same members. In order to trim down the list of properties, Select-Object can t just remove the properties I don t want, because the result wouldn t be a process object anymore. Instead, Select-Object creates a new kind of custom object called a PSObject. It copies over the properties I do want from the process, resulting in a custom object being placed into the pipeline.
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