while Iteration command
Usage
while (<condition>) <command>
Description

Executes <command> while the <condition> evaluates to true (non zero result).
<command> may be either a single command or a block of commands.
It can contain the break command: in that case the execution of the <command> will be immediately interrupted and the control transferred to the command following this while block.
It is valid for <command> to be an empty command terminated with a ;. <condition> is an expression as the ones evaluated by $(*) with the following extensions:
If <condition> is a string, its length is evaluated: in this way a non-empty string causes the <condition> to be true, an empty string causes it to be false.
If <condition> is an array, its size is evaluated: in this way a non-empty array causes the <condition> to be true, an empty array causes it to be false.
If <condition> is a hash, the number of its entries is evaluated: in this way a non-empty hash causes the <condition> to be true, an empty hash causes it to be false.

Examples
%i = 0; while(%i < 100)%i++ while(%i > 0) { %i -= 10 if(%i < 20)break; } echo %i

Index, Commands