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One of the main reasons administrators write scripts is to automate repetitive tasks after all, you have more important things to do than renaming a bunch of files or setting permissions to a folder structure Computers are excellent for these kinds of tasks, because they don t get tired, they don t complain, and in general they can do this around the clock, even while you are sound asleep Another key construct in any scripting language is the ability to create loops in your script A typical example would be a script to go through all the files in a folder and rename each file so that it is prefixed by the string backup- Loops are quite simple, but they are one of the biggest reasons why scripts go wild In general, the loop has a condition that defines when it should stop doing whatever it is that it s doing Sometimes coding or logic errors result in a state in which that condition is never met and your script gets caught up in an endless loop that keeps on going, since the condition to make it stop will never happen You can implement loops in Windows PowerShell in four ways: For, Foreach, While, and Do While statements The For statement, otherwise known as a For loop, runs a block of code until a condition is found to be true Normally, you would use a For loop when you want to initialize a variable, run it while the condition is true, and then run some code that is repeated for each execution FOR loops have the following syntax:
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For(<init>;<condition>;<repeat>) { <code to run in the loop> }
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The following code snippet is a For loop that counts from 1 to 100:
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For($i=1;$i -lt 101;$i++) { write-host $i }
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The <Init> section is executed only once for the For loop and is used for initialization In this example, I used this section to initialize $i to the value of 1 The <Condition> section defines what condition must be true before the code in the code block gets executed In this example, I state that if $i is less than 101, it can execute the code The <Repeat> section is code that is executed each time the loop executes In this case, I increment $i by 1 by using the shorthand notation of $i++, which is functionally equivalent to $i = $i + 1 Finally, for each iteration of the loop, I output the value of $i This effectively makes the script count from 1 to 100 since once $i is incremented to the value of 101, the condition that $i is less than 101 is no longer true and the loop stops executing NOTE If you have a programming background or have used C, C++, or Java, the ++ operator should be nothing new to you In fact, many constructs in Windows PowerShell should be familiar to anyone who has worked with the C programming language The Foreach statement is used to loop through a collection of items Unlike the For loop where you define a variable, a stop condition, and repeating code, the Foreach
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statement is designed to take a collection as its parameter and run a block of code for each item in that collection (hence the name) Foreach statements have the following syntax:
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Foreach ($<item> in $<collection>) { <command_block> }
This is an extremely useful looping statement The following code snippet shows how you can use Foreach to display the name of an item in the Windows directory:
Foreach ($file in Get-ChildItem C:\Windows) { write-host $file }
Hopefully a light bulb just lit up above your head You can run any PowerShell code in the command block so you can easily convert this Foreach example to do something useful For example, you might use this code to rename every item in a specific folder You can use Foreach to iterate through any collection, including arrays The While statement, otherwise known as a While loop, is similar to a For loop in that it runs a command block any number of times while a condition is true, except its only parameter is a condition statement This means that initializing or incrementing any variables to make sure the condition will eventually evaluate to false so that the loop will end has to be done separately The syntax for a While loop is this:
While(<condition>) { <code_block> }
Notice how much simpler it is than a For loop To compare the two, the following code snippet shows how we can use a While loop to have our script count from 1 to 100:
$i = 1 while($i -lt 101) { write-host $i $i++ }
The Do While statement is an interesting variation of the While loop in that just like the While loop, it loops through a code block while a condition is true The main differentiator is that since the condition is checked at the end of the code block, every Do loop is guaranteed to execute at least once Consider the following example:
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