.net barcode reader sdk PowerShell for Microsoft SharePoint 2010 Administrators in .NET framework

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PS > $spWebUpdate() PS > $spWebDescription Changed through PowerShell
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In the example, we begin by retrieving the current description Then we assign a new string value to the Description property, and finally, we use the Update() method to commit the changes we made When we retrieve the object again, the description is changed When you are finished working with an object, use the Dispose() method to ensure that the object is disposed of correctly
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PS > $spWebDispose()
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This is good practice because SPWeb, SPSite, and SPSiteAdministration objects may take up large amounts of memory We will discuss disposing objects in more detail in 7
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Automatic Variables
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The Windows PowerShell automatic variables are fixed variables that store state information Table 5-2 describes these variables
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Variable $$ $
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$_ $args $ConsoleFileName $Error $Event $EventSubscriber $ExecutionContext $false $foreach $Home
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Contents The last token in the last line received by the session True or false, depending on the last performed operation The first token from the last line received by the session The current object in the pipeline object An array of values passed to a function or a script The path of the console file that was most recently used in the session An array of error objects representing the most recent error that occurred A PSEventArgs object that represents the event that is being processed A PSEventSubscriber object that represents the event subscriber of the event that is being processed An EngineIntrinsics object that represents the execution context of the Windows PowerShell host Boolean false The enumerator of a foreach loop User s home directory
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Table 5-2 Windows PowerShell Automatic Variables (continued)
5:
Variables, Arrays, and Hashtables
Variable $Host $input
Contents Information regarding the current host An enumerator that contains the input passed to a function $LastExitCode The last exit code of the last program that was run $Matches Result of the last successful regular expression match $MyInvocation Information regarding the context under which the script, function, or script block was run $NestedPromptLevel The current prompt level $NULL An empty value $PID The process identifier of the process that is hosting the current Windows PowerShell session $Profile The full path to the Windows PowerShell profile for the current user $PSBoundParameters A dictionary of the active parameters and their current values $PsCmdlet The cmdlet that is being run $PsCulture The name of the culture currently in use $PsDebugContext Information about the debugging environment while debugging $PsHome The full path of the installation directory of Windows PowerShell $PsScriptRoot The directory from which the script module is being executed $PsUICulture The name of the user interface culture that is currently in use in the operating system $PsVersionTable A read-only hashtable containing details about the version of Windows PowerShell $Pwd The current directory $ShellID Identifier of the current shell $SourceArgs Objects that represent the event arguments of the current event $SourceEventArgs The first object that represents the first event argument that derives from EventArgs of the event that is being processed $This Reference to the current object in script methods and properties $true Boolean true
Table 5-2 Windows PowerShell Automatic Variables
PowerShell for Microsoft SharePoint 2010 Administrators
You can list the variables in Windows PowerShell by using the Get-ChildItem or
Get-Variable cmdlet
PS > Get-ChildItem Variable: PS> Get-Variable
These commands return both automatic variables and user-created variables To display the value of a specific automatic variable, simply type the automatic variable s name
PS > $PSHOME C:\Windows\System32\WindowsPowerShell\v10
It is also possible to use the value of a variable as input to cmdlets in Windows PowerShell In the next example, we use the value of the $PsHome variable with the Get-ChildItem cmdlet to retrieve all items from the Windows PowerShell home directory
PS > Get-ChildItem $PSHOME
When working with pipelines and loops in Windows PowerShell, you use the automatic variable $_ to handle the current object in the pipeline In 3, we used the Select-Object cmdlet and created a calculated property using a hashtable and the $_ variable Other cmdlets support the $_ variable 7 shows examples of its use with the Where-Object and ForEach-Object cmdlets You can get more information about automatic variables by using the Get-Help cmdlet
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