PowerShell: Loop, Iteration
“For” Statement
for
statement is useful if you also need the index of the array.
$arr = 0..9 for ($i=0; $i -le $arr.length; $i=$i+1) { $arr[$i] } # prints 0 to 9
“While” Statement
while
statement is most useful if you need to test a condition before the loop.
$a = 0..9 $i=5 while($i -lt 10) { $a[$i]; $i++ } # prints 5 to 9
“Foreach” Statement
foreach
statement is useful when you want to go thru all the values of array or collection.
foreach statement must be on a single line, when used in PowerShell prompt.
$arr = 1..9 foreach ($x in $arr) { echo $x } # prints 1 to 9
ForEach-Object Cmdlet
ForEach-Object
Cmdlet is most useful when you need to pipe to it.
The input can be a array type or collection.
ForEach-Object
has alias:%
,foreach
ForEach-Object ScriptBlock
- Example:
dir | ForEach-Object {$_.fullname}