PS > Get-Help about_Automatic_variables in .NET framework

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PS > Get-Help about_Automatic_variables
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Preference Variables
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Windows PowerShell includes a set of preference variables that let you customize its behavior The preference variables affect the environment and how commands behave Table 5-3 describes the preference variables available in Windows PowerShell You can modify the preference variables by changing their value For example, the following example changes the warning preference to silently continue
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PS > $WarningPreference = "SilentlyContinue" PS > $WarningPreference SilentlyContinue
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When you modify a preference variable in Windows PowerShell, the change affects only the current session In order to make a persistent change to a preference variable, add the modification to a profile script, as this example shows:
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'$WarningPreference = "SilentlyContinue"' | Out-File $PSHOME\profileps1 -Append
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Variables, Arrays, and Hashtables
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Variable $ConfirmPreference
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Description Sets the level of impact that operations have before requesting confirmation: none, low, medium, or high Controls how Windows PowerShell handles debugging messages written by a script or a cmdlet Sets the default error-handling action Controls how Windows PowerShell should output errors to the shell Determines how many enumerated items are included in a display Logs errors and exceptions in command initialization and processing Logs the start and stop of a command in a pipeline Logs session error and failures Logs the opening and closing of a session Logs adding and removing of providers in Windows PowerShell Logs provider errors Determines how many aliases are permitted in the current session Determines how many errors are saved in the error history Determines how many functions are permitted in the current session Determines how many commands are saved in the command history for the current session Determines how many variables are permitted in the current session Output field separator specifies the character that an element in an array is separated with when the array is converted to a string
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$DebugPreference
$ErrorActionPreference $ErrorView $FormatEnumerationLimit $LogCommandHealthEvent $LogCommandLifeCycleEvent $LogEngineHealthEvent $LogEngineLifeCycleEvent $LogProviderLifeCycleEvent $LogProviderHealthEvent $MaximumAliasCount $MaximumErrorCount $MaximumFunctionCount $MaximumHistoryCount
$MaximumVariableCount $OFS
Table 5-3 Windows PowerShell Preference Variables (continued)
PowerShell for Microsoft SharePoint 2010 Administrators
Variable $OutputEncoding $ProgressPreference
Description Determines the default character encoding used by Windows PowerShell Determines how Windows PowerShell responds to progress updates generated by a script Specifies the default e-mail server used by Windows PowerShell cmdlets Specifies the default application name for a remote command that uses WSManagement technology
$PSEmailServer $PSSessionApplicationName
$PSSessionConfigurationName Specifies the default session configuration that is used for PSSessions created in the current session $PSSessionOption $VerbosePreference Establishes the default values for advanced user options in a remote session Controls how Windows PowerShell handles verbose messages written by a script or a cmdlet Controls how Windows PowerShell handles warning messages written by a script or a cmdlet Determines if WhatIf is automatically enabled for every command that supports it
$WarningPreference
$WhatIfPreference
Table 5-3 Windows PowerShell Preference Variables
A profile script executes each time Windows PowerShell starts Profile scripts in Windows PowerShell are described in 8
Environment Variables
Environment variables store information regarding the operating system environment You can display the environment variables available using the Get-ChildItem cmdlet
PS > Get-ChildItem env:
Here s how to retrieve a specific environment variable:
PS > Get-ChildItem env:COMPUTERNAME Name Value
5:
Variables, Arrays, and Hashtables
---COMPUTERNAME
----SPSERVER01
To display the value of the environment variable, add its name
PS > $env:COMPUTERNAME SPSERVER01
As with other variables, you can modify an environment variable by changing its value, as in this example:
PS > $env:COMPUTERNAME = "NewName" PS > $env:COMPUTERNAME NewName
As with preference variables, all changes made to the environment variables using Windows PowerShell affect only the current session To permanently change environment variables, add the modifications to a profile script NOTE You can also permanently change environment variables through the SetEnvironmentVariable() static method available from the SystemEnvironment class
Arrays in Windows PowerShell
An array is a container that is used for storing a collection of data elements An array in Windows PowerShell can contain objects of all types supported by NET All arrays are origin zero, meaning that the first element in an array is always at index 0, the second element is at index 1, and so on Many cmdlets in Windows PowerShell return output in the form of an array Here is an example of creating a simple array containing numeric values:
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