about_remote_output - PowerShell command help and examples

Describes how to interpret and format the output of remote commands. (about_remote_output)

Describes how to interpret and format the output of remote commands.
The output of a command that was run on a remote computer might look like output of the same command run on a local computer, but there are some significant differences. This topic explains how to interpret, format, and display the output of commands that are run on remote computers. DISPLAYING THE COMPUTER NAME When you use the Invoke-Command cmdlet to run a command on a remote computer, the command returns an object that includes the name of the computer that generated the data. The remote computer name is stored in the PSComputerName property. For many commands, the PSComputerName is displayed by default. For example, the following command runs a Get-Culture command on two remote computers, Server01 and Server02. The output, which appears below, includes the names of the remote computers on which the command ran. C:\PS> invoke-command -script {get-culture} -comp Server01, Server02 LCID Name DisplayName PSComputerName ---- ---- ----------- -------------- 1033 en-US English (United States) Server01 1033 es-AR Spanish (Argentina) Server02 You can use the HideComputerName parameter of Invoke-Command to hide the PSComputerName property. This parameter is designed for commands that collect data from only one remote computer. The following command runs a Get-Culture command on the Server01 remote computer. It uses the HideComputerName parameter to hide the PSComputerName property and related properties. C:\PS> invoke-command -scr {get-culture} -comp Server01 -HideComputerName LCID Name DisplayName ---- ---- ----------- 1033 en-US English (United States) You can also display the PSComputerName property if it is not displayed by default. For example, the following commands use the Format-Table cmdlet to add the PSComputerName property to the output of a remote Get-Date command. C:\PS> $dates = invoke-command -script {get-date} -computername Server01, Server02 C:\PS> $dates | format-table DateTime, PSComputerName -auto DateTime PSComputerName -------- -------------- Monday, July 21, 2008 7:16:58 PM Server01 Monday, July 21, 2008 7:16:58 PM Server02 DISPLAYING THE MACHINENAME PROPERTY Several cmdlets, including Get-Process, Get-Service, and Get-EventLog, have a ComputerName parameter that gets the objects on a remote computer. These cmdlets do not use Windows PowerShell remoting, so you can use them even on computers that are not configured for remoting in Windows PowerShell. The objects that these cmdlets return store the name of the remote computer in the MachineName property. (These objects do not have a PSComputerName property.) For example, this command gets the PowerShell process on the Server01 and Server02 remote computers. The default display does not include the MachineName property. C:\PS> get-process powershell -computername server01, server02 Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id ProcessName ------- ------ ----- ----- ----- ------ -- ----------- 920 38 97524 114504 575 9.66 2648 powershell 194 6 24256 32384 142 3020 powershell 352 27 63472 63520 577 3.84 4796 powershell You can use the Format-Table cmdlet to display the MachineName property of the process objects. For example, the following command saves the processes in the $p variable and then uses a pipeline operator (|) to send the processes in $p to the Format-Table command. The command uses the Property parameter of Format-Table to include the MachineName property in the display. C:\PS> $p = get-process powershell -comp Server01, Server02 C:\PS> $P | format-table -property ID, ProcessName, MachineName -auto Id ProcessName MachineName -- ----------- ----------- 2648 powershell Server02 3020 powershell Server01 4796 powershell Server02 The following more complex command adds the MachineName property to the default process display. It uses hash tables to specify calculated properties. Fortunately, you do not have to understand it to use it. (Note that the backtick [`] is the continuation character.) C:\PS> $p = get-process powershell -comp Server01, Server02 C:\PS> $p | format-table -property Handles, ` @{Label="NPM(K)";Expression={[int]($_.NPM/1024)}}, ` @{Label="PM(K)";Expression={[int]($_.PM/1024)}}, ` @{Label="WS(K)";Expression={[int]($_.WS/1024)}}, ` @{Label="VM(M)";Expression={[int]($_.VM/1MB)}}, ` @{Label="CPU(s)";Expression={if ($_.CPU -ne $()){ $_.CPU.ToString("N")}}}, ` Id, ProcessName, MachineName -auto Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id ProcessName MachineName ------- ------ ----- ----- ----- ------ -- ----------- ----------- 920 38 97560 114532 576 2648 powershell Server02 192 6 24132 32028 140 3020 powershell Server01 438 26 48436 59132 565 4796 powershell Server02 DESERIALIZED OBJECTS When you run remote commands that generate output, the command output is transmitted across the network back to the local computer. Because most live Microsoft .NET Framework objects (such as the objects that Windows PowerShell cmdlets return) cannot be transmitted over the network, the live objects are "serialized". In other words, the live objects are converted into XML representations of the object and its properties. Then, the XML-based serialized object is transmitted across the network. On the local computer, Windows PowerShell receives the XML-based serialized object and "deserializes" it by converting the XML-based object into a standard .NET Framework object. However, the deserialized object is not a live object. It is a snapshot of the object at the time that it was serialized, and it includes properties but no methods. You can use and manage these objects in Windows PowerShell, including passing them in pipelines, displaying selected properties, and formatting them. Most deserialized objects are automatically formatted for display by entries in the Types.ps1xml or Format.ps1xml files. However, the local computer might not have formatting files for all of the deserialized objects that were generated on a remote computer. When objects are not formatted, all of the properties of each object appear in the console in a streaming list. When objects are not formatted automatically, you can use the formatting cmdlets, such as Format-Table or Format-List, to format and display selected properties. Or, you can use the Out-GridView cmdlet to display the objects in a table. Also, if you run a command on a remote computer that uses cmdlets that you do not have on your local computer, the objects that the command returns might not be formatted properly because you do not have the formatting files for those objects on your computer. To get formatting data from another computer, use the Get-FormatData and Export-FormatData cmdlets. Some object types, such as DirectoryInfo objects and GUIDs, are converted back into live objects when they are received. These objects do not need any special handling or formatting. ORDERING THE RESULTS The order of the computer names in the ComputerName parameter of cmdlets determines the order in which Windows PowerShell connects to the remote computers. However, the results appear in the order in which the local computer receives them, which might be a different order. To change the order of the results, use the Sort-Object cmdlet. You can sort on the PSComputerName or MachineName property. You can also sort on another property of the object so that the results from different computers are interspersed. SEE ALSO about_Remote Format-Table Get-EventLog Get-Process Get-Service Get-WmiObject Invoke-Command Out-GridView Select-Object C:\Windows>powershell get-help about_remote_requirements -full

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PowerShell: Describes how to interpret and format the output of remote commands.

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