PowerShell for Microsoft SharePoint 2010 Administrators in .NET framework

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Url --http://spserver01 http://spserver01/Web1 http://spserver01/Web10 http://spserver01/Web2 http://spserver01/Web3 http://spserver01/Web4 http://spserver01/Web5 http://spserver01/Web6 http://spserver01/Web7 http://spserver01/Web8 http://spserver01/Web9
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Here, we use the Get-SPSite and Get-SPWeb cmdlets to retrieve all the sites in a specific site collection and store them in the $spWebs variable First, we use the $spWebs variable in the test pipeline of the for loop to determine how many times the loop needs to run Notice how we use the count property to retrieve the number of sites In the command block, we use the same variable to return an array containing all sites, and then retrieve each individual site in a new iteration of the loop, using the index notation and the $i variable Finally, we pipe the site object to the SelectObject cmdlet and retrieve the Url and Created properties
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The do/while Loop
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The while and do/while loops are language constructs used to run a command block as long as a condition evaluates to true Here is an example on a simple while loop:
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PS PS $i $i $i $i > > = = = = $i = 0 while ($i -le 4) { "`$i = $i"; $i++ } 1 2 3 4
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This example repeats the command block as long as the value of the $i variable is not equal to 4 The variable is incremented in the code block We also use a backtick character (`) to comment away $i in the output The backtick character is typically used to return variable names in the output The do/while loop is a variation of the while loop In the while loop, the condition is checked in the beginning of the loop In the do/while loop, the condition is checked in the end of the loop Here is an example of a do/while loop:
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PS > do { $i++; "`$i = $i";} while ($i -le 4) $i = 1 $i = 2
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Flow Control and Object Disposal
$i = 3 $i = 4 $i = 5
In this example, the loop increases by one as long as the variable is less than or equal to 4 Notice how the value 5 is returned in the output This happens because the while condition is still true when the variable $i is equal to 5
The foreach Loop
The foreach loop is a construct used to iterate through a series of values in a collection of items A block of code contained within braces is used to execute a statement for each item in the collection Here is an example of a basic foreach loop:
PS > $items = 1,2,3,4,5 PS > foreach($item in $items) { $item } 1 2 3 4 5
The example iterates through each element in the array and performs the operation specified in the block of code on each element You can also use the foreach loop when working with SharePoint 2010 The example below demonstrates how to iterate through items in a site collections recycle bin and display the items Web, Title, and also display who deleted the item
PS > foreach($i in (Get-SPSite http://SPServer01)RecycleBin) { >> >> >> >> } >> Name ---Web Item DeletedBy Value ----Team Site Tasks POWERSHELL\sezel @{"Web"=$iWeb} @{"Item"=$iTitle} @{"DeletedBy" = $iDeletedBy}
PowerShell for Microsoft SharePoint 2010 Administrators
Flow-Control Cmdlets
Windows PowerShell also includes two cmdlets that rely on scriptblocks : ForEachObject and Where-Object A ScriptBlock is a chunk of PowerShell code enclosed in braces Note that scriptblocks are also used in functions, filters, and variables In fact, anything that you can type in a Windows PowerShell prompt can be placed in a scriptblock
The ForEach-Object Cmdlet
ForEach-Object is a flow-control cmdlet that is used to perform an operation on each object in a pipeline It uses the automatic variable $_ to represent the current object and
processes one object at a time The operation to perform is described within a script block The ForEach-Object cmdlet has the alias foreach, so you can use that instead of typing the full cmdlet name When you use foreach in a pipeline, Windows PowerShell interprets the command as the ForEach-Object cmdlet However, when you use foreach at the beginning of a command, the foreach construct is used instead of the ForEach-Object cmdlet The foreach construct is used to iterate through a series of values in a collection of items, and basically works in the same way as the ForEach-Object cmdlet The difference lies in how the objects are processed, the foreach statement stores the whole collection in memory before processing while the ForEach-Object cmdlet reads one object at the time Another difference is that the foreach statement does not use the $_ variable Instead the loop variable is specified in the construct Here is a simple example of how to use the ForEach-Object cmdlet:
PS > $num = 1,2,3,4,5 PS > $num | ForEach-Object { $_ } 1 2 3 4 5
Notice how we use $_ to work with the current object being processed by the ForEach-Object cmdlet Here is an example of using the foreach alias:
PS > $num | foreach { $_ } 1 2 3 4 5
Since we are sending an array through a pipeline, Windows PowerShell interprets the foreach command as the ForEach-Object cmdlet
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