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With two elements on the right side but one on the left, the operator returns only the first element If you add a second value on the left side, you can retrieve both values:
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PS > "{0} {1}" -f "PowerShell","Windows" PowerShell Windows
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You can also switch the places of the numeric values to change the output
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The subexpression operator ($()) returns the result of one or more statements If the result contains multiple values, an array is returned The next example demonstrates how to use the subexpression operator
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PS > "There are: $((Get-Command -Noun SP*)Count) SharePoint cmdlets available in Windows PowerShell" There are: 531 SharePoint cmdlets available in Windows PowerShell
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PowerShell for Microsoft SharePoint 2010 Administrators
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The array subexpression operator (@()) returns the result of one or more statements as an array You can use the operator to create a simple array, as shown in this example:
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You can access elements in the array by their index
PS > @("Windows","PowerShell")[0] Windows PS > @("Windows","PowerShell")[1] PowerShell
The comma operator (,) is a binary operator used to create simple arrays in Windows PowerShell
PS > 1,2,3 1 2 3
You can also use the comma operator to place a single line in an array
PS > $array = ,"PowerShell" PS > $array[0] PowerShell
When you place a comma operator in front of a value, Windows PowerShell treats the value as an element in an array When you place the statement in a variable and call the first element in the array, the string value is returned
Summary
The chapter described a variety of operators that we can use to compare and manipulate values in Windows PowerShell Arithmetic Operators These operators allow you to calculate values Assignment Operators These operators allow you to assign one or more values to variables Comparison Operators These operators allow you to compare values and test if values match a specific pattern Logical Operators These operators allow you to combine expressions and check for multiple conditions in one statement
6:
Operators
Redirection Operators These operators allow you to send the output to a file Type Operators object These operators allow you to find or change the type of an
Special Operators These operators allow you to perform specific tasks that other operators are unable to perform If you want to find out more information about operators in Windows PowerShell, you can use the Get-Help cmdlet followed by about_Operators
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Flow Control and Object Disposal
PowerShell for Microsoft SharePoint 2010 Administrators
ike other powerful programming and scripting languages, Windows PowerShell supports looping and branching logic The looping statements in Windows PowerShell let you perform sequences of commands on all members of a collection (such as sites in a site collection) or on only those that meet a particular condition Windows PowerShell also includes two cmdlets that can be used for flow control This chapter covers how to use these flow-control facilities, as well as how to dispose of objects
Conditional Statements
Windows PowerShell supports the conditional statement if/elseif/else, which branches execution based on a condition, and the switch statement, which can handle multiple complex conditions
The if/elseif/else Statement
The if/elseif/else statement allows you to execute a block of code if a specified condition is met However, the statement can also execute a block of code if a condition is not met This statement uses comparison operators to test the condition The following is a simple if/elseif/else statement
PS > PS > >> >> } >> >> } >> Disk $url = "http://SPServer01" if((Get-SPSiteAdministration $url)DiskUsed -gt 20MB) { "Disk space used is more than 20 MB" else { "Disk space used is less than 20 MB"
space used is less than 20 MB
In this example, we use the Get-SPSiteAdministration cmdlet to retrieve the size (the amount of disk space used) of a site collection We then use an if/else statement to check if this size exceeds 20MB If so, we return Disk space used is more than 20MB If the condition is not met, we return Disk space used is less than 20MB The next example demonstrates the use of the elseif keyword within the if/ elseif/else statement
PS PS >> >> >> >> > $url = "http://SPServer01" > if((Get-SPSiteAdministration $url)DiskUsed -gt 20MB) { "Disk space used is more than 20 MB" } elseif((Get-SPSiteAdministration $url)DiskUsed -gt 10MB) { "Disk space used is more than 10 MB" } else {
7:
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