Loops in windows powershell scripting

Powershell Scripting Tutorial

Introduction Tools required for Powershell First Powershell script Interacting with user Special characters in Windows Powershell scripting Arrays String manipulation Conditional statements Looping statements Passing arguments Passing named arguments Exit status of the script Writing functions

Loops in windows powershell scripting

We have below looping statements in Powershell

C-Style for loop
foreach

C-style for loop

You can use below syntax to create a for loop.

 
for ($i=1;$i -lt 10; $i++) {
    echo “Printing $i”
    }

foreach (also called as % and foreach-object) loop

You can use foreach loop to iterate through arrays and collections.

 
foreach ($city in $cities) {
    echo “City is $city”
    }

You can also use foreach loop to work on piped data as shown in below example. Here we are printing length of each line in the file.

 
> Get-Content cities.txt | foreach {echo $_.length}

While Loop

Powershell also provides while loop and do..while loop constructs just like C language. Below example shows the simple while loop. It will print values from 0 to 6 and then exit.

 
$i=0
while($true)
{
     echo $i
     if ($i-gt 5){
         break
    }

$i = $i + 1

}

Do….While Loop

Powershell also provides do..while loop construct just like C language. Below example shows the simple do….while loop. It will print values from 0 to 6 and then exit.

 
$i=0
do
{
       echo $i
      if ($i-gt 5){
          break
     }

$i = $i + 1

}while($true)

Do…Until Loop

You can use do until loop using below syntax. Below script will print from 0 to 5 and then exit.

 
$i=0
do
{
echo $i
$i = $i + 1

}until($i -gt 5)

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