Loops

Loops may be used to iterate through collections, performing an operation against each element in the collection, or to repeat an operation (or series of operations) until a condition is met.

The following loops will be demonstrated in this section:

• foreach
• for
• do
• while

The foreach loop is perhaps the most common of these loops.

Foreach loop

The foreach loop executes against each element of a collection using the following notation:

foreach (<element> in <collection>) { 
    <statements> 
} 

For example, the foreach loop may be used to iterate through each of the processes returned by Get-Process:

foreach ($process in Get-Process) { 
    Write-Host $process.Name 
}

If the collection is $null or empty, the body of the loop will not execute.

foreach and foreach

PowerShell comes with the alias foreach for the ForEach-Object command. When this alias acts depends on context.

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