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PS > $array = 1,2,3 PS > $array 1 2 3
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You can also create an array using the array subexpression operator @, as shown here:
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PS > $array = @(1,2,3)
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You can access specific elements in arrays To retrieve the first element, type the following:
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PS > $array[0] 1
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Notice how we use the value 0 to retrieve the first element, since the indexing of array elements in Windows PowerShell starts with zero If we used 1, the second element would be returned You can change an element in an array by assigning it a new value, as in this example:
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PS > $array[1] = "Two" PS > $array 1 Two 3
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Use the += operator to add an element to an array
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PS > $array += "Four" PS > $array 1 Two 3 Four
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You can also count the number of elements in an array by using the Count property
PS > $arrayCount 4
NOTE The Count property used in this example is actually an alias for the SystemArray Length property It is available through the typesps1xml file, which is a built-in XML file that adds several elements to the NET Framework types in Windows PowerShell When cmdlets return more than one result, Windows PowerShell automatically wraps the result into an array In the following example, we store the output of the Get-SPWebTemplate cmdlet in a variable and use the Count property to check how many elements the array contains
PS > $SPWebTemplate = Get-SPWebTemplate PS > $SPWebTemplateCount 50
Again, if we want to retrieve the first element, we can simply type the following:
PS > $SPWebTemplate[0] Name ---GLOBAL#0 Title ----Global template LocaleId -------1033 Custom -----False
5:
Variables, Arrays, and Hashtables
You can also use ranges when retrieving elements in an array
PS > $SPWebTemplate[02] Name ---GLOBAL#0 STS#0 STS#1 Title ----Global template Team Site Blank Site LocaleId -------1033 1033 1033 Custom -----False False False
It is even possible to use negative numbers when working with arrays To retrieve the last element in the array, use -1
PS > $SPWebTemplate[-1] Name ---visprus#0 Title ----Visio Process Repository LocaleId -------1033 Custom -----False
You will see a lot more examples on working with arrays in the upcoming chapters
Hashtables in Windows PowerShell
Windows PowerShell also includes hashtables, or associative arrays Hashtables use key/value pairs instead of a numeric index to access the elements You can create a hashtable by placing one or more key/value pairs inside @{}
PS > $hashTable = @{"FirstName"="Jean-Luc";"LastName"="Picard"} PS > $hashTable Name ---FirstName LastName Value ----Jean-Luc Picard
You can access specific elements in a hashtable in two ways: using dot notation or by typing the key within square brackets Here s how to use dot notation:
PS > $hashTableFirstName Jean-Luc PS > $hashTableLastName Picard
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And here s the square bracket form:
PS > $hashTable["FirstName"] Jean-Luc PS > $hashTable["LastName"] Picard
You can also send a hashtable down a pipeline and use the Select-Object cmdlet to retrieve specific elements
PS > $hashTable | Select @{Name="Name";Expression={$_["FirstName"]}} Name ---Jean-Luc
To change a key/value pair in a hashtable, you can use either form to access it and assign the new value, as in these examples:
PS > $hashTableFirstName = "William" PS > $hashTable["LastName"] = "Riker" PS > $hashTable Name ---LastName FirstName Value ----Riker William
You can also store multiple hashtables in an array In this example, we store two hashtables in an array
PS > $hashTable = @{"FirstName"="Jean-Luc";"LastName"="Picard"}, @{"FirstName"="William";"LastName"="Riker"} PS > $hashTable Name ---LastName FirstName LastName FirstName Value ----Picard Jean-Luc Riker William
5:
Variables, Arrays, and Hashtables
When multiple hashtables are in an array, to access elements in the hashtable, you need to index into a specific element; otherwise, Windows PowerShell will not know which element you want to retrieve
PS > $hashTable[0] Name ---LastName FirstName Value ----Picard Jean-Luc
PS > $hashTable[0]FirstName
In this example, we retrieve the first hashtable in the array and return the key/ value pair
Summary
In this chapter, we covered the core functionality of Windows PowerShell The first part of the chapter demonstrated how to use variables to store objects in Windows PowerShell, and we also took a quick dive through methods and properties Then we looked at arrays and ways of working with them The last part of the chapter covered hashtables and showed examples of how to use them in Windows PowerShell
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Operators
PowerShell for Microsoft SharePoint 2010 Administrators
indows PowerShell supports several types of operators, including some interesting and powerful ones that are not typically found in scripting or programming languages This chapter covers the operators that you will most commonly use when working with Windows PowerShell and SharePoint 2010
Arithmetic Operators
The basic arithmetic operators include those to add, multiply, subtract, divide, and calculate the remainder of a division Table 6-1 lists these operators Let s take a closer look at the + operator To add the values 1 and 5 together, you could type this:
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