PowerShell has a number of looping structures – do; while; for; foreach. This is how the PowerShell while loop works
The while statement has the form:
while (<condition>){<statement list>}
The while loop is probably the simplest of the PowerShell loops. For example:
$x = 0
while ($x -lt 5){
Write-Host “`$x is $x”
$x++
}
gives:
$x is 0
$x is 1
$x is 2
$x is 3
$x is 4
As long as the condition is true the statement list is executed
The condition is evaluated BEFORE the loop is executed meaning that it may never run
PS> $x = 10
while ($x -lt 5){
Write-Host “`$x is $x”
$x++
}
PS>
The value of $x is greater than 4 so the loop never executes.
under: PowerShell