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Flow Control and Object Disposal
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>> "Disk space used is less than 10 MB" >> } >> Disk space used is more than 10 MB
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The elseif keyword lets you introduce another condition and a corresponding additional execution branch You can add any number of elseif keywords to an if/ elseif/else statement
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The switch Statement
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The switch statement is a series of if statements and is used to evaluate a condition against a number of potential matches The switch statement matches the expression with each of the conditions, and if a match is found, an action associated with the condition is performed If more than one condition applies, the switch statement will execute each of the applicable conditions The following is a simple switch statement
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PS > $a = 1 PS > switch($a) { >> 1 { "contains one" } >> 2 { "contains two" } >> } >> contains one
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In this example, we choose an action based on the value in parentheses after the
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switch keyword The value is matched with each of the conditions If a match is
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found, the action associated with that condition is performed The default comparison operator used by the switch statement is the -eq operator It is possible to use other operators when using the switch statement, as the next example demonstrates
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PS > PS > >> >> >> >> >> } >> Disk $url = "http://SPServer01" switch((Get-SPSiteAdministration $url)DiskUsed) { {$_ -gt 20MB} { "Disk space used is more than 20 MB"; Break } {$_ -gt 10MB} { "Disk space used is more than 10 MB"; Break } {$_ -gt 5MB} { "Disk space used is more than 5 MB"; Break } Default { "Disk space used is less than 5 MB" }
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space used is more than 10 MB
In this example, the values in parentheses are the amount of disk space used The value is then matched against the patterns in each clause, and if a match is found, the corresponding clause is executed Since a Break is used at the end of each condition,
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the switch stops as soon as a match is made The Default clause is used to perform an action if none of the switch values match the pattern Notice how we use the $_ variable to reference the input object The switch statement supports a couple of options that you can use to control the pattern matching By default, the switch statement is case-insensitive You can perform a case-sensitive pattern match with the -Casesensitive option
PS > $url = "http://SPServer01" PS > switch -CaseSensitive ($url) { >> "http://SPServer01" {"matches http://SPServer01"; Break } >> "http://SPSERVER01" {"matches http://SPSERVER01"; Break } >> default {"no match found"} >> } >> matches http://SPServer01
We can also use wildcard pattern matching with the switch statement Here is an example:
PS > $url = "http://SPServer01" PS > switch -WildCard -CaseSensitive ($url) { >> "http*[S]*" {"Starts with 'http' and contains a upper-case S"; Break } >> "http*[s]*" {"Starts with 'http' and contains a lower-case s"; Break } >> } >> Starts with 'http' and contains a upper-case S
In this example, first we check if the value of the variable $url starts with a 'http' and contains an uppercase S Then we check if the value of the variable $url starts with 'http' and contains a lowercase s Since the first pattern matches the variable, the corresponding clause is executed The switch statement also supports regular expressions, which let you create complex pattern matches Here is an example:
PS > $url = "http://SPServer01" PS > switch -regex ($url) { >> "^(http|https):/{2}" {"match found"} >> } >> match found
In this example, we test if the value of the variable $url starts with 'http' or 'https' followed by the : character and two / characters
7:
Flow Control and Object Disposal
Looping Statements
The looping statements in Windows PowerShell include for, while, do/while, and foreach
The for Loop
The for loop is a construct used to run commands in a statement block for as long as the specified condition evaluates to true The for loop is often used to iterate through an array or other type of collection and run a set of commands against each of its elements Here is an example of a simple for loop:
PS > for($i = 1; $i -le 5; $i ++) { $i } 1 2 3 4 5
The example returns the value of $i as long as $i is less than or equal 5 Each time the for loop evaluates, the condition increments the value by 1 The for loop is often used to loop through an array and run a command on each element in the array Here is an example:
PS > $array = 1,2,3,4,5 PS > for($i = 0; $i -lt ($arraycount); $i ++) { $array[$i] * 10 } 10 20 30 40 50
In this example, we first create an array holding the values 1 to 5 We then use the array in the for loop to specify how many times the loop should run Notice how we place the array within parentheses in order to calculate the number of times the for loop should run You can also use the for loop to iterate through a collection of sites, as shown in this example:
PS PS PS >> >> > $url = "http://SPServer01" > $spWebs = Get-SPSite -Identity $url | Get-SPWeb > for($i = 0; $i -lt $spWebsCount; $i ++) { $spWebs[$i] | Select-Object -Property Url, Created }
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